跳至主要内容
SvelteKit核心概念

表单操作

一个 +page.server.js 文件可以导出 操作，允许你使用 <form> 元素将数据 POST 到服务器。

当使用 <form> 时，客户端 JavaScript 是可选的，但你可以轻松地通过 JavaScript 渐进增强你的表单交互，以提供最佳的用户体验。

默认操作

在最简单的情况下，页面声明一个 default 操作

src/routes/login/+page.server
/** @satisfies {import('./$types').Actions} */
export const 
const actions: {
    default: (event: any) => Promise<void>;
}
@satisfies{import('./$types').Actions}
actions = {
	default: (event: any) => Promise<void>default: async (event: anyevent) => {
		// TODO log the user in
	}
};
import type { 
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions } from './$types';

export const 
const actions: {
    default: (event: Kit.RequestEvent<Record<string, any>, string | null>) => Promise<void>;
}
actions = {
	default: (event: Kit.RequestEvent<Record<string, any>, string | null>) => Promise<void>default: async (event: Kit.RequestEvent<Record<string, any>, string | null>event) => {
		// TODO log the user in
	}
} satisfies 
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions;

要从 /login 页面调用此操作，只需添加一个 <form> - 不需要 JavaScript

src/routes/login/+page
<form method="POST">
	<label>
		Email
		<input name="email" type="email">
	</label>
	<label>
		Password
		<input name="password" type="password">
	</label>
	<button>Log in</button>
</form>

如果有人点击按钮，浏览器将通过 POST 请求将表单数据发送到服务器，运行默认操作。

操作始终使用 POST 请求，因为 GET 请求永远不应该有副作用。

我们也可以从其他页面调用操作（例如，如果根布局的导航中有一个登录小部件）通过添加 action 属性，指向页面

src/routes/+layout
<form method="POST" action="/login">
	<!-- content -->
</form>

命名操作

页面可以拥有任意数量的命名操作，而不是一个 default 操作

src/routes/login/+page.server
/** @satisfies {import('./$types').Actions} */
export const 
const actions: {
    login: (event: any) => Promise<void>;
    register: (event: any) => Promise<void>;
}
@satisfies{import('./$types').Actions}
actions = {
	default: async (event) => {
	login: (event: any) => Promise<void>login: async (event: anyevent) => {
		// TODO log the user in
	},
	register: (event: any) => Promise<void>register: async (event: anyevent) => {
		// TODO register the user
	}
};
import type { 
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions } from './$types';

export const 
const actions: {
    login: (event: Kit.RequestEvent<Record<string, any>, string | null>) => Promise<void>;
    register: (event: Kit.RequestEvent<Record<string, any>, string | null>) => Promise<...>;
}
actions = {
	default: async (event) => {
	login: (event: Kit.RequestEvent<Record<string, any>, string | null>) => Promise<void>login: async (event: Kit.RequestEvent<Record<string, any>, string | null>event) => {
		// TODO log the user in
	},
	register: (event: Kit.RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: Kit.RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
} satisfies 
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
type Actions = {
    [x: string]: Kit.Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions;

要调用命名操作，请添加一个查询参数，其名称以 / 字符为前缀

src/routes/login/+page
<form method="POST" action="?/register">
src/routes/+layout
<form method="POST" action="/login?/register">

除了 action 属性之外，我们还可以使用按钮上的 formaction 属性将相同的表单数据 POST 到与父 <form> 不同的操作。

src/routes/login/+page
<form method="POST" action="?/login">
	<label>
		Email
		<input name="email" type="email">
	</label>
	<label>
		Password
		<input name="password" type="password">
	</label>
	<button>Log in</button>
	<button formaction="?/register">Register</button>
</form>

我们不能在命名操作旁边有默认操作，因为如果你在没有重定向的情况下将数据 POST 到命名操作，查询参数会保留在 URL 中，这意味着下一个默认 POST 将通过之前的命名操作。

操作的结构

每个操作都会收到一个 RequestEvent 对象，允许你使用 request.formData() 读取数据。在处理请求后（例如，通过设置 cookie 登录用户），操作可以使用将在相应页面上的 form 属性以及 $page.form（在整个应用中，直到下次更新）中可用的数据进行响应。

src/routes/login/+page.server
import * as module "$lib/server/db"db from '$lib/server/db';

/** @type {import('./$types').PageServerLoad} */
export async function function load(event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>): MaybePromise<void | Record<string, any>>
@type{import('./$types').PageServerLoad}
load({ cookies: Cookies
Get or set cookies related to the current request


cookies }) {
	const const user: anyuser = await module "$lib/server/db"db.getUserFromSession(cookies: Cookies
Get or set cookies related to the current request


cookies.Cookies.get(name: string, opts?: CookieParseOptions): string | undefined
Gets a cookie that was previously set with cookies.set, or from the request headers.


@paramname the name of the cookie
@paramopts the options, passed directly to cookie.parse. See documentation here
get('sessionid'));
	return { user: anyuser };
}

/** @satisfies {import('./$types').Actions} */
export const 
const actions: {
    login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<{
        success: boolean;
    }>;
    register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<...>;
}
@satisfies{import('./$types').Actions}
actions = {
	
login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<{
    success: boolean;
}>
login: async ({ cookies: Cookies
Get or set cookies related to the current request


cookies, request: Request
The original request object


request }) => {
		const const data: FormDatadata = await request: Request
The original request object


request.Body.formData(): Promise<FormData>
MDN Reference


formData();
		const const email: FormDataEntryValue | nullemail = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('email');
		const const password: FormDataEntryValue | nullpassword = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('password');

		const const user: anyuser = await module "$lib/server/db"db.getUser(const email: FormDataEntryValue | nullemail);
		cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.set(name: string, value: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Sets a cookie. This will add a set-cookie header to the response, but also make the cookie available via cookies.get or cookies.getAll during the current request.


The httpOnly and secure options are true by default (except on https://127.0.0.1, where secure is false), and must be explicitly disabled if you want cookies to be readable by client-side JavaScript and/or transmitted over HTTP. The sameSite option defaults to lax.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramvalue the cookie value
@paramopts the options, passed directly to cookie.serialize. See documentation here
set('sessionid', await module "$lib/server/db"db.createSession(const user: anyuser), { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });

		return { success: booleansuccess: true };
	},
	register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
};
import * as module "$lib/server/db"db from '$lib/server/db';
import type { type PageServerLoad = (event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>) => MaybePromise<void | Record<string, any>>PageServerLoad, 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions } from './$types';

export const const load: PageServerLoadload: type PageServerLoad = (event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>) => MaybePromise<void | Record<string, any>>PageServerLoad = async ({ cookies: Cookies
Get or set cookies related to the current request


cookies }) => {
	const const user: anyuser = await module "$lib/server/db"db.getUserFromSession(cookies: Cookies
Get or set cookies related to the current request


cookies.Cookies.get(name: string, opts?: CookieParseOptions): string | undefined
Gets a cookie that was previously set with cookies.set, or from the request headers.


@paramname the name of the cookie
@paramopts the options, passed directly to cookie.parse. See documentation here
get('sessionid'));
	return { user: anyuser };
};

export const 
const actions: {
    login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<{
        success: boolean;
    }>;
    register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<...>;
}
actions = {
	
login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<{
    success: boolean;
}>
login: async ({ cookies: Cookies
Get or set cookies related to the current request


cookies, request: Request
The original request object


request }) => {
		const const data: FormDatadata = await request: Request
The original request object


request.Body.formData(): Promise<FormData>
MDN Reference


formData();
		const const email: FormDataEntryValue | nullemail = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('email');
		const const password: FormDataEntryValue | nullpassword = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('password');

		const const user: anyuser = await module "$lib/server/db"db.getUser(const email: FormDataEntryValue | nullemail);
		cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.set(name: string, value: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Sets a cookie. This will add a set-cookie header to the response, but also make the cookie available via cookies.get or cookies.getAll during the current request.


The httpOnly and secure options are true by default (except on https://127.0.0.1, where secure is false), and must be explicitly disabled if you want cookies to be readable by client-side JavaScript and/or transmitted over HTTP. The sameSite option defaults to lax.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramvalue the cookie value
@paramopts the options, passed directly to cookie.serialize. See documentation here
set('sessionid', await module "$lib/server/db"db.createSession(const user: anyuser), { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });

		return { success: booleansuccess: true };
	},
	register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
} satisfies 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions;
src/routes/login/+page
<script>
	/** @type {{ data: import('./$types').PageData, form: import('./$types').ActionData }} */
	let { data, form } = $props();
</script>

{#if form?.success}
	<!-- this message is ephemeral; it exists because the page was rendered in
	       response to a form submission. it will vanish if the user reloads -->
	<p>Successfully logged in! Welcome back, {data.user.name}</p>
{/if}
<script lang="ts">
	import type { PageData, ActionData } from './$types';

	let { data, form }: { data: PageData, form: ActionData } = $props();
</script>

{#if form?.success}
	<!-- this message is ephemeral; it exists because the page was rendered in
	       response to a form submission. it will vanish if the user reloads -->
	<p>Successfully logged in! Welcome back, {data.user.name}</p>
{/if}
传统模式

在 Svelte 4 中，你将使用 export let data 和 export let form 来声明属性

验证错误

如果由于数据无效而无法处理请求，你可以将验证错误（以及之前提交的表单值）返回给用户，以便他们可以重试。fail 函数允许你返回一个 HTTP 状态代码（通常是 400 或 422，在验证错误的情况下）以及数据。状态代码可通过 $page.status 获取，数据可通过 form 获取

src/routes/login/+page.server
import { function fail(status: number): ActionFailure<undefined> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
fail } from '@sveltejs/kit';
import * as module "$lib/server/db"db from '$lib/server/db';

/** @satisfies {import('./$types').Actions} */
export const 
const actions: {
    login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
        email: string | null;
        missing: boolean;
    }> | ActionFailure<{
        ...;
    }> | {
        ...;
    }>;
    register: (event: RequestEvent<...>) => Promise<...>;
}
@satisfies{import('./$types').Actions}
actions = {
	
login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
    email: string | null;
    missing: boolean;
}> | ActionFailure<{
    email: FormDataEntryValue;
    incorrect: boolean;
}> | {
    ...;
}>
login: async ({ cookies: Cookies
Get or set cookies related to the current request


cookies, request: Request
The original request object


request }) => {
		const const data: FormDatadata = await request: Request
The original request object


request.Body.formData(): Promise<FormData>
MDN Reference


formData();
		const const email: FormDataEntryValue | nullemail = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('email');
		const const password: FormDataEntryValue | nullpassword = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('password');

		if (!const email: FormDataEntryValue | nullemail) {
			return 
fail<{
    email: string | null;
    missing: boolean;
}>(status: number, data: {
    email: string | null;
    missing: boolean;
}): ActionFailure<{
    email: string | null;
    missing: boolean;
}> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: string | nullemail, missing: booleanmissing: true });
		}

		const const user: anyuser = await module "$lib/server/db"db.getUser(const email: FormDataEntryValueemail);

		if (!const user: anyuser || const user: anyuser.password !== module "$lib/server/db"db.hash(const password: FormDataEntryValue | nullpassword)) {
			return 
fail<{
    email: FormDataEntryValue;
    incorrect: boolean;
}>(status: number, data: {
    email: FormDataEntryValue;
    incorrect: boolean;
}): ActionFailure<{
    email: FormDataEntryValue;
    incorrect: boolean;
}> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: FormDataEntryValueemail, incorrect: booleanincorrect: true });
		}

		cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.set(name: string, value: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Sets a cookie. This will add a set-cookie header to the response, but also make the cookie available via cookies.get or cookies.getAll during the current request.


The httpOnly and secure options are true by default (except on https://127.0.0.1, where secure is false), and must be explicitly disabled if you want cookies to be readable by client-side JavaScript and/or transmitted over HTTP. The sameSite option defaults to lax.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramvalue the cookie value
@paramopts the options, passed directly to cookie.serialize. See documentation here
set('sessionid', await module "$lib/server/db"db.createSession(const user: anyuser), { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });

		return { success: booleansuccess: true };
	},
	register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
};
import { function fail(status: number): ActionFailure<undefined> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
fail } from '@sveltejs/kit';
import * as module "$lib/server/db"db from '$lib/server/db';
import type { 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions } from './$types';

export const 
const actions: {
    login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
        email: string | null;
        missing: boolean;
    }> | ActionFailure<{
        ...;
    }> | {
        ...;
    }>;
    register: (event: RequestEvent<...>) => Promise<...>;
}
actions = {
	
login: ({ cookies, request }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
    email: string | null;
    missing: boolean;
}> | ActionFailure<{
    email: FormDataEntryValue;
    incorrect: boolean;
}> | {
    ...;
}>
login: async ({ cookies: Cookies
Get or set cookies related to the current request


cookies, request: Request
The original request object


request }) => {
		const const data: FormDatadata = await request: Request
The original request object


request.Body.formData(): Promise<FormData>
MDN Reference


formData();
		const const email: FormDataEntryValue | nullemail = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('email');
		const const password: FormDataEntryValue | nullpassword = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('password');

		if (!const email: FormDataEntryValue | nullemail) {
			return 
fail<{
    email: string | null;
    missing: boolean;
}>(status: number, data: {
    email: string | null;
    missing: boolean;
}): ActionFailure<{
    email: string | null;
    missing: boolean;
}> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: string | nullemail, missing: booleanmissing: true });
		}

		const const user: anyuser = await module "$lib/server/db"db.getUser(const email: FormDataEntryValueemail);

		if (!const user: anyuser || const user: anyuser.password !== module "$lib/server/db"db.hash(const password: FormDataEntryValue | nullpassword)) {
			return 
fail<{
    email: FormDataEntryValue;
    incorrect: boolean;
}>(status: number, data: {
    email: FormDataEntryValue;
    incorrect: boolean;
}): ActionFailure<{
    email: FormDataEntryValue;
    incorrect: boolean;
}> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: FormDataEntryValueemail, incorrect: booleanincorrect: true });
		}

		cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.set(name: string, value: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Sets a cookie. This will add a set-cookie header to the response, but also make the cookie available via cookies.get or cookies.getAll during the current request.


The httpOnly and secure options are true by default (except on https://127.0.0.1, where secure is false), and must be explicitly disabled if you want cookies to be readable by client-side JavaScript and/or transmitted over HTTP. The sameSite option defaults to lax.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramvalue the cookie value
@paramopts the options, passed directly to cookie.serialize. See documentation here
set('sessionid', await module "$lib/server/db"db.createSession(const user: anyuser), { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });

		return { success: booleansuccess: true };
	},
	register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
} satisfies 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions;

请注意，作为预防措施，我们只将电子邮件返回到页面 - 而不是密码。

src/routes/login/+page
<form method="POST" action="?/login">
	{#if form?.missing}<p class="error">The email field is required</p>{/if}
	{#if form?.incorrect}<p class="error">Invalid credentials!</p>{/if}
	<label>
		Email
		<input name="email" type="email" value={form?.email ?? ''}>
	</label>
	<label>
		Password
		<input name="password" type="password">
	</label>
	<button>Log in</button>
	<button formaction="?/register">Register</button>
</form>

返回的数据必须能够序列化为 JSON。除此之外，结构完全由你决定。例如，如果页面上有多个表单，你可以使用 id 属性或类似属性来区分返回的 form 数据所引用的 <form>。

重定向

重定向（和错误）的工作方式与 load 中完全相同

src/routes/login/+page.server
import { function fail(status: number): ActionFailure<undefined> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
fail, function redirect(status: 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | ({} & number), location: string | URL): never
Redirect a request. When called during request handling, SvelteKit will return a redirect response.
Make sure you’re not catching the thrown redirect, which would prevent SvelteKit from handling it.


@paramstatus The HTTP status code. Must be in the range 300-308.
@paramlocation The location to redirect to.
@throwsRedirect This error instructs SvelteKit to redirect to the specified location.
@throwsError If the provided status is invalid.
redirect } from '@sveltejs/kit';
import * as module "$lib/server/db"db from '$lib/server/db';

/** @satisfies {import('./$types').Actions} */
export const 
const actions: {
    login: ({ cookies, request, url }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
        email: FormDataEntryValue | null;
        missing: boolean;
    }> | ActionFailure<...> | {
        ...;
    }>;
    register: (event: RequestEvent<...>) => Promise<...>;
}
@satisfies{import('./$types').Actions}
actions = {
	
login: ({ cookies, request, url }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
    email: FormDataEntryValue | null;
    missing: boolean;
}> | ActionFailure<...> | {
    ...;
}>
login: async ({ cookies: Cookies
Get or set cookies related to the current request


cookies, request: Request
The original request object


request, url: URL
The requested URL.


url }) => {
		const const data: FormDatadata = await request: Request
The original request object


request.Body.formData(): Promise<FormData>
MDN Reference


formData();
		const const email: FormDataEntryValue | nullemail = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('email');
		const const password: FormDataEntryValue | nullpassword = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('password');

		const const user: anyuser = await module "$lib/server/db"db.getUser(const email: FormDataEntryValue | nullemail);
		if (!const user: anyuser) {
			return 
fail<{
    email: FormDataEntryValue | null;
    missing: boolean;
}>(status: number, data: {
    email: FormDataEntryValue | null;
    missing: boolean;
}): ActionFailure<...> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: FormDataEntryValue | nullemail, missing: booleanmissing: true });
		}

		if (const user: anyuser.password !== module "$lib/server/db"db.hash(const password: FormDataEntryValue | nullpassword)) {
			return 
fail<{
    email: FormDataEntryValue | null;
    incorrect: boolean;
}>(status: number, data: {
    email: FormDataEntryValue | null;
    incorrect: boolean;
}): ActionFailure<...> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: FormDataEntryValue | nullemail, incorrect: booleanincorrect: true });
		}

		cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.set(name: string, value: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Sets a cookie. This will add a set-cookie header to the response, but also make the cookie available via cookies.get or cookies.getAll during the current request.


The httpOnly and secure options are true by default (except on https://127.0.0.1, where secure is false), and must be explicitly disabled if you want cookies to be readable by client-side JavaScript and/or transmitted over HTTP. The sameSite option defaults to lax.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramvalue the cookie value
@paramopts the options, passed directly to cookie.serialize. See documentation here
set('sessionid', await module "$lib/server/db"db.createSession(const user: anyuser), { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });

		if (url: URL
The requested URL.


url.URL.searchParams: URLSearchParams
MDN Reference


searchParams.URLSearchParams.has(name: string, value?: string): boolean
Returns a Boolean indicating if such a search parameter exists.


MDN Reference


has('redirectTo')) {
			function redirect(status: 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | ({} & number), location: string | URL): never
Redirect a request. When called during request handling, SvelteKit will return a redirect response.
Make sure you’re not catching the thrown redirect, which would prevent SvelteKit from handling it.


@paramstatus The HTTP status code. Must be in the range 300-308.
@paramlocation The location to redirect to.
@throwsRedirect This error instructs SvelteKit to redirect to the specified location.
@throwsError If the provided status is invalid.
redirect(303, url: URL
The requested URL.


url.URL.searchParams: URLSearchParams
MDN Reference


searchParams.URLSearchParams.get(name: string): string | null
Returns the first value associated to the given search parameter.


MDN Reference


get('redirectTo'));
		}

		return { success: booleansuccess: true };
	},
	register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
};
import { function fail(status: number): ActionFailure<undefined> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
fail, function redirect(status: 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | ({} & number), location: string | URL): never
Redirect a request. When called during request handling, SvelteKit will return a redirect response.
Make sure you’re not catching the thrown redirect, which would prevent SvelteKit from handling it.


@paramstatus The HTTP status code. Must be in the range 300-308.
@paramlocation The location to redirect to.
@throwsRedirect This error instructs SvelteKit to redirect to the specified location.
@throwsError If the provided status is invalid.
redirect } from '@sveltejs/kit';
import * as module "$lib/server/db"db from '$lib/server/db';
import type { 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions } from './$types';

export const 
const actions: {
    login: ({ cookies, request, url }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
        email: FormDataEntryValue | null;
        missing: boolean;
    }> | ActionFailure<...> | {
        ...;
    }>;
    register: (event: RequestEvent<...>) => Promise<...>;
}
actions = {
	
login: ({ cookies, request, url }: RequestEvent<Record<string, any>, string | null>) => Promise<ActionFailure<{
    email: FormDataEntryValue | null;
    missing: boolean;
}> | ActionFailure<...> | {
    ...;
}>
login: async ({ cookies: Cookies
Get or set cookies related to the current request


cookies, request: Request
The original request object


request, url: URL
The requested URL.


url }) => {
		const const data: FormDatadata = await request: Request
The original request object


request.Body.formData(): Promise<FormData>
MDN Reference


formData();
		const const email: FormDataEntryValue | nullemail = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('email');
		const const password: FormDataEntryValue | nullpassword = const data: FormDatadata.FormData.get(name: string): FormDataEntryValue | null
MDN Reference


get('password');

		const const user: anyuser = await module "$lib/server/db"db.getUser(const email: FormDataEntryValue | nullemail);
		if (!const user: anyuser) {
			return 
fail<{
    email: FormDataEntryValue | null;
    missing: boolean;
}>(status: number, data: {
    email: FormDataEntryValue | null;
    missing: boolean;
}): ActionFailure<...> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: FormDataEntryValue | nullemail, missing: booleanmissing: true });
		}

		if (const user: anyuser.password !== module "$lib/server/db"db.hash(const password: FormDataEntryValue | nullpassword)) {
			return 
fail<{
    email: FormDataEntryValue | null;
    incorrect: boolean;
}>(status: number, data: {
    email: FormDataEntryValue | null;
    incorrect: boolean;
}): ActionFailure<...> (+1 overload)
Create an ActionFailure object.


@paramstatus The HTTP status code. Must be in the range 400-599.
@paramdata Data associated with the failure (e.g. validation errors)
fail(400, { email: FormDataEntryValue | nullemail, incorrect: booleanincorrect: true });
		}

		cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.set(name: string, value: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Sets a cookie. This will add a set-cookie header to the response, but also make the cookie available via cookies.get or cookies.getAll during the current request.


The httpOnly and secure options are true by default (except on https://127.0.0.1, where secure is false), and must be explicitly disabled if you want cookies to be readable by client-side JavaScript and/or transmitted over HTTP. The sameSite option defaults to lax.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramvalue the cookie value
@paramopts the options, passed directly to cookie.serialize. See documentation here
set('sessionid', await module "$lib/server/db"db.createSession(const user: anyuser), { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });

		if (url: URL
The requested URL.


url.URL.searchParams: URLSearchParams
MDN Reference


searchParams.URLSearchParams.has(name: string, value?: string): boolean
Returns a Boolean indicating if such a search parameter exists.


MDN Reference


has('redirectTo')) {
			function redirect(status: 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | ({} & number), location: string | URL): never
Redirect a request. When called during request handling, SvelteKit will return a redirect response.
Make sure you’re not catching the thrown redirect, which would prevent SvelteKit from handling it.


@paramstatus The HTTP status code. Must be in the range 300-308.
@paramlocation The location to redirect to.
@throwsRedirect This error instructs SvelteKit to redirect to the specified location.
@throwsError If the provided status is invalid.
redirect(303, url.searchParams.get('redirectTo'));
		}

		return { success: booleansuccess: true };
	},
	register: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>register: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		// TODO register the user
	}
} satisfies 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions;

加载数据

操作运行后，页面将重新渲染（除非发生重定向或意外错误），并且操作的返回值作为 form 属性提供给页面。这意味着你的页面的 load 函数将在操作完成后运行。

请注意，handle 在调用操作之前运行，并且在 load 函数之前不会重新运行。这意味着，例如，如果你使用 handle 基于 cookie 填充 event.locals，则必须在操作中设置或删除 cookie 时更新 event.locals

src/hooks.server
/** @type {import('@sveltejs/kit').Handle} */
export async function 
function handle(input: {
    event: RequestEvent;
    resolve(event: RequestEvent, opts?: ResolveOptions): MaybePromise<Response>;
}): MaybePromise<...>
@type{import('@sveltejs/kit').Handle}
handle({ event: RequestEvent<Partial<Record<string, string>>, string | null>event, resolve: (event: RequestEvent, opts?: ResolveOptions) => MaybePromise<Response>resolve }) {
	event: RequestEvent<Partial<Record<string, string>>, string | null>event.RequestEvent<Partial<Record<string, string>>, string | null>.locals: App.Locals
Contains custom data that was added to the request within the server handle hook.


locals.
App.Locals.user: {
    name: string;
} | null
user = await 
function getUser(sessionid: string | undefined): {
    name: string;
}
getUser(event: RequestEvent<Partial<Record<string, string>>, string | null>event.RequestEvent<Partial<Record<string, string>>, string | null>.cookies: Cookies
Get or set cookies related to the current request


cookies.Cookies.get(name: string, opts?: CookieParseOptions): string | undefined
Gets a cookie that was previously set with cookies.set, or from the request headers.


@paramname the name of the cookie
@paramopts the options, passed directly to cookie.parse. See documentation here
get('sessionid'));
	return resolve: (event: RequestEvent, opts?: ResolveOptions) => MaybePromise<Response>resolve(event: RequestEvent<Partial<Record<string, string>>, string | null>event);
}
import type { 
type Handle = (input: {
    event: RequestEvent;
    resolve(event: RequestEvent, opts?: ResolveOptions): MaybePromise<Response>;
}) => MaybePromise<...>
The handle hook runs every time the SvelteKit server receives a request and
determines the response.
It receives an event object representing the request and a function called resolve, which renders the route and generates a Response.
This allows you to modify response headers or bodies, or bypass SvelteKit entirely (for implementing routes programmatically, for example).


Handle } from '@sveltejs/kit';

export const const handle: Handlehandle: 
type Handle = (input: {
    event: RequestEvent;
    resolve(event: RequestEvent, opts?: ResolveOptions): MaybePromise<Response>;
}) => MaybePromise<...>
The handle hook runs every time the SvelteKit server receives a request and
determines the response.
It receives an event object representing the request and a function called resolve, which renders the route and generates a Response.
This allows you to modify response headers or bodies, or bypass SvelteKit entirely (for implementing routes programmatically, for example).


Handle = async ({ event: RequestEvent<Partial<Record<string, string>>, string | null>event, resolve: (event: RequestEvent, opts?: ResolveOptions) => MaybePromise<Response>resolve }) => {
	event: RequestEvent<Partial<Record<string, string>>, string | null>event.RequestEvent<Partial<Record<string, string>>, string | null>.locals: App.Locals
Contains custom data that was added to the request within the server handle hook.


locals.
App.Locals.user: {
    name: string;
} | null
user = await 
function getUser(sessionid: string | undefined): {
    name: string;
}
getUser(event: RequestEvent<Partial<Record<string, string>>, string | null>event.RequestEvent<Partial<Record<string, string>>, string | null>.cookies: Cookies
Get or set cookies related to the current request


cookies.Cookies.get(name: string, opts?: CookieParseOptions): string | undefined
Gets a cookie that was previously set with cookies.set, or from the request headers.


@paramname the name of the cookie
@paramopts the options, passed directly to cookie.parse. See documentation here
get('sessionid'));
	return resolve: (event: RequestEvent, opts?: ResolveOptions) => MaybePromise<Response>resolve(event: RequestEvent<Partial<Record<string, string>>, string | null>event);
};
src/routes/account/+page.server
/** @type {import('./$types').PageServerLoad} */
export function function load(event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>): MaybePromise<void | Record<string, any>>
@type{import('./$types').PageServerLoad}
load(event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>event) {
	return {
		
user: {
    name: string;
} | null
user: event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>event.RequestEvent<Record<string, any>, string | null>.locals: App.Locals
Contains custom data that was added to the request within the server handle hook.


locals.
App.Locals.user: {
    name: string;
} | null
user
	};
}

/** @satisfies {import('./$types').Actions} */
export const 
const actions: {
    logout: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>;
}
@satisfies{import('./$types').Actions}
actions = {
	logout: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>logout: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		event: RequestEvent<Record<string, any>, string | null>event.RequestEvent<Record<string, any>, string | null>.cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.delete(name: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Deletes a cookie by setting its value to an empty string and setting the expiry date in the past.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramopts the options, passed directly to cookie.serialize. The path must match the path of the cookie you want to delete. See documentation here
delete('sessionid', { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });
		event: RequestEvent<Record<string, any>, string | null>event.RequestEvent<Params extends Partial<Record<string, string>> = Partial<Record<string, string>>, RouteId extends string | null = string | null>.locals: App.Locals
Contains custom data that was added to the request within the server handle hook.


locals.
App.Locals.user: {
    name: string;
} | null
user = null;
	}
};
import type { type PageServerLoad = (event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>) => MaybePromise<void | Record<string, any>>PageServerLoad, 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions } from './$types';

export const const load: PageServerLoadload: type PageServerLoad = (event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>) => MaybePromise<void | Record<string, any>>PageServerLoad = (event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>event) => {
	return {
		
user: {
    name: string;
} | null
user: event: ServerLoadEvent<Record<string, any>, Record<string, any>, string | null>event.RequestEvent<Record<string, any>, string | null>.locals: App.Locals
Contains custom data that was added to the request within the server handle hook.


locals.
App.Locals.user: {
    name: string;
} | null
user
	};
};

export const 
const actions: {
    logout: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>;
}
actions = {
	logout: (event: RequestEvent<Record<string, any>, string | null>) => Promise<void>logout: async (event: RequestEvent<Record<string, any>, string | null>event) => {
		event: RequestEvent<Record<string, any>, string | null>event.RequestEvent<Record<string, any>, string | null>.cookies: Cookies
Get or set cookies related to the current request


cookies.
Cookies.delete(name: string, opts: CookieSerializeOptions & {
    path: string;
}): void
Deletes a cookie by setting its value to an empty string and setting the expiry date in the past.


You must specify a path for the cookie. In most cases you should explicitly set path: '/' to make the cookie available throughout your app. You can use relative paths, or set path: '' to make the cookie only available on the current path and its children


@paramname the name of the cookie
@paramopts the options, passed directly to cookie.serialize. The path must match the path of the cookie you want to delete. See documentation here
delete('sessionid', { path: string
Specifies the value for the 
{@link 
https://tools.ietf.org/html/rfc6265#section-5.2.4 Path Set-Cookie attribute
}
.
By default, the path is considered the “default path”.


path: '/' });
		event: RequestEvent<Record<string, any>, string | null>event.RequestEvent<Params extends Partial<Record<string, string>> = Partial<Record<string, string>>, RouteId extends string | null = string | null>.locals: App.Locals
Contains custom data that was added to the request within the server handle hook.


locals.
App.Locals.user: {
    name: string;
} | null
user = null;
	}
} satisfies 
type Actions = {
    [x: string]: Action<Record<string, any>, void | Record<string, any>, string | null>;
}
Actions;

渐进增强

在前面的章节中，我们构建了一个 /login 操作，该操作 无需客户端 JavaScript 即可工作 - 没有 fetch。这很好，但是当 JavaScript 可用时，我们可以渐进增强表单交互以提供更好的用户体验。

use:enhance

渐进增强表单的最简单方法是添加 use:enhance 操作

src/routes/login/+page
<script>
	import { enhance } from '$app/forms';

	/** @type {{ form: import('./$types').ActionData }} */
	let { form } = $props();
</script>

<form method="POST" use:enhance>
<script lang="ts">
	import { enhance } from '$app/forms';
	import type { ActionData } from './$types';

	let { form }: { form: ActionData } = $props();
</script>

<form method="POST" use:enhance>

use:enhance 只能与具有 method="POST" 的表单一起使用。它不适用于 method="GET"，这是没有指定方法的表单的默认值。尝试在没有 method="POST" 的表单上使用 use:enhance 将导致错误。

是的，enhance 操作和 <form action> 都称为“操作”有点令人困惑。这些文档内容丰富。抱歉。

如果没有参数，use:enhance 将模拟浏览器原生行为，只是没有完整的页面重新加载。它将

  • 在成功或无效的响应上更新 form 属性、$page.form 和 $page.status，但前提是操作在您正在提交的同一页面上。例如，如果您的表单类似于 <form action="/somewhere/else" ..>，则 不会 更新 form 和 $page。这是因为在原生表单提交的情况下，您将被重定向到操作所在的页面。如果您希望无论如何都更新它们，请使用 applyAction
  • 重置 <form> 元素
  • 在成功响应时使用 invalidateAll 使所有数据失效
  • 在重定向响应时调用 goto
  • 如果发生错误，则渲染最近的 +error 边界
  • 将 焦点重置 到相应的元素

自定义 use:enhance

要自定义行为，你可以提供一个 SubmitFunction，它会在提交表单之前立即运行，并且（可选）返回一个使用 ActionResult 运行的回调。请注意，如果你返回一个回调，则上面提到的默认行为将不会触发。要将其恢复，请调用 update。

<form
	method="POST"
	use:enhance={({ formElement, formData, action, cancel, submitter }) => {
		// `formElement` is this `<form>` element
		// `formData` is its `FormData` object that's about to be submitted
		// `action` is the URL to which the form is posted
		// calling `cancel()` will prevent the submission
		// `submitter` is the `HTMLElement` that caused the form to be submitted

		return async ({ result, update }) => {
			// `result` is an `ActionResult` object
			// `update` is a function which triggers the default logic that would be triggered if this callback wasn't set
		};
	}}
>

你可以使用这些函数来显示和隐藏加载 UI 等。

如果你返回一个回调，你可能需要重现默认 use:enhance 行为的一部分，但不会在成功响应时使所有数据失效。你可以使用 applyAction 来做到这一点

src/routes/login/+page
<script>
	import { enhance, applyAction } from '$app/forms';

	/** @type {{ form: import('./$types').ActionData }} */
	let { form } = $props();
</script>

<form
	method="POST"
	use:enhance={({ formElement, formData, action, cancel }) => {
		return async ({ result }) => {
			// `result` is an `ActionResult` object
			if (result.type === 'redirect') {
				goto(result.location);
			} else {
				await applyAction(result);
			}
		};
	}}
>
<script lang="ts">
	import { enhance, applyAction } from '$app/forms';
	import type { ActionData } from './$types';

	let { form }: { form: ActionData } = $props();
</script>

<form
	method="POST"
	use:enhance={({ formElement, formData, action, cancel }) => {
		return async ({ result }) => {
			// `result` is an `ActionResult` object
			if (result.type === 'redirect') {
				goto(result.location);
			} else {
				await applyAction(result);
			}
		};
	}}
>

applyAction(result) 的行为取决于 result.type

  • success、failure - 将 $page.status 设置为 result.status 并将 form 和 $page.form 更新为 result.data（无论您从哪里提交，这与 enhance 中的 update 相反）
  • redirect - 调用 goto(result.location, { invalidateAll: true })
  • error - 使用 result.error 渲染最近的 +error 边界

在所有情况下，焦点都将重置。

自定义事件监听器

我们也可以自己实现渐进增强，而无需 use:enhance，使用 <form> 上的普通事件监听器

src/routes/login/+page
<script>
	import { invalidateAll, goto } from '$app/navigation';
	import { applyAction, deserialize } from '$app/forms';

	/** @type {{ form: import('./$types').ActionData }} */
	let { form } = $props();

	/** @param {{ currentTarget: EventTarget & HTMLFormElement}} event */
	async function handleSubmit(event) {
		const data = new FormData(event.currentTarget);

		const response = await fetch(event.currentTarget.action, {
			method: 'POST',
			body: data
		});

		/** @type {import('@sveltejs/kit').ActionResult} */
		const result = deserialize(await response.text());

		if (result.type === 'success') {
			// rerun all `load` functions, following the successful update
			await invalidateAll();
		}

		applyAction(result);
	}
</script>

<form method="POST" onsubmit|preventDefault={handleSubmit}>
	<!-- content -->
</form>
<script lang="ts">
	import { invalidateAll, goto } from '$app/navigation';
	import { applyAction, deserialize } from '$app/forms';
	import type { ActionData } from './$types';
	import type { ActionResult } from '@sveltejs/kit';

	let { form }: { form: ActionData } = $props();

	async function handleSubmit(event: { currentTarget: EventTarget & HTMLFormElement}) {
		const data = new FormData(event.currentTarget);

		const response = await fetch(event.currentTarget.action, {
			method: 'POST',
			body: data
		});

		const result: ActionResult = deserialize(await response.text());

		if (result.type === 'success') {
			// rerun all `load` functions, following the successful update
			await invalidateAll();
		}

		applyAction(result);
	}
</script>

<form method="POST" onsubmit|preventDefault={handleSubmit}>
	<!-- content -->
</form>

请注意，你需要在使用 $app/forms 中相应的方法进一步处理响应之前对其进行 反序列化。JSON.parse() 不够，因为表单操作 - 就像 load 函数一样 - 也支持返回 Date 或 BigInt 对象。

如果你在 +page.server.js 旁边有一个 +server.js，fetch 请求将默认路由到那里。要改为 POST 到 +page.server.js 中的操作，请使用自定义 x-sveltekit-action 标头

const const response: Responseresponse = await function fetch(input: string | URL | globalThis.Request, init?: RequestInit): Promise<Response> (+1 overload)
MDN Reference


fetch(this.action, {
	RequestInit.method?: string | undefined
A string to set request’s method.


method: 'POST',
	RequestInit.body?: BodyInit | null | undefined
A BodyInit object or null to set request’s body.


body: data,
	RequestInit.headers?: HeadersInit | undefined
A Headers object, an object literal, or an array of two-item arrays to set request’s headers.


headers: {
		'x-sveltekit-action': 'true'
	}
});

替代方案

表单操作是将数据发送到服务器的首选方式，因为它们可以渐进增强，但你也可以使用 +server.js 文件公开（例如）JSON API。以下是这种交互可能的样子

src/routes/send-message/+page
<script>
	function rerun() {
		fetch('/api/ci', {
			method: 'POST'
		});
	}
</script>

<button onclick={rerun}>Rerun CI</button>
src/routes/api/ci/+server
/** @type {import('./$types').RequestHandler} */
export function function POST(): void
@type{import('./$types').RequestHandler}
POST() {
	// do something
}
import type { 
type RequestHandler = (event: Kit.RequestEvent<Record<string, any>, string | null>) => MaybePromise<Response>
type RequestHandler = (event: Kit.RequestEvent<Record<string, any>, string | null>) => MaybePromise<Response>
RequestHandler } from './$types';
export const const POST: RequestHandlerPOST: 
type RequestHandler = (event: Kit.RequestEvent<Record<string, any>, string | null>) => MaybePromise<Response>
type RequestHandler = (event: Kit.RequestEvent<Record<string, any>, string | null>) => MaybePromise<Response>
RequestHandler = () => {
	// do something
};

GET 与 POST

正如我们所见，要调用表单操作，必须使用 method="POST"。

有些表单不需要将数据 POST 到服务器 - 例如搜索输入。对于这些，你可以使用 method="GET"（或等效地，不使用 method），SvelteKit 将将其视为 <a> 元素，使用客户端路由器而不是完整页面导航

<form action="/search">
	<label>
		Search
		<input name="q">
	</label>
</form>

提交此表单将导航到 /search?q=... 并调用你的 load 函数，但不会调用操作。与 <a> 元素一样，你可以在 <form> 上设置 data-sveltekit-reload、data-sveltekit-replacestate、data-sveltekit-keepfocus 和 data-sveltekit-noscroll 属性来控制路由器的行为。

进一步阅读

在 GitHub 上编辑此页面

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