WeakMap.prototype.delete()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

WeakMap 实例的 delete() 方法从该 WeakMap 中删除指定的元素。

尝试一下

const weakmap1 = new WeakMap();
const object1 = {};

weakmap1.set(object1, 42);

console.log(weakmap1.delete(object1));
// Expected output: true

console.log(weakmap1.has(object1));
// Expected output: false

概述

delete() 方法可以从一个 WeakMap 对象中删除指定的元素。

语法

js
weakMapInstance.delete(key)

参数

key

要从 WeakMap 对象中删除的元素的键。

返回值

如果成功在 WeakMap 对象中删除了元素,则返回 true。如果未在 WeakMap 中找到该键,则返回 false。如果 key 不是对象或非全局注册的符号,则始终返回 false

示例

使用 delete() 方法

js
const wm = new WeakMap();
wm.set(window, "foo");

wm.delete(window); // 返回 true。成功删除。

wm.has(window); // 返回 false。WeakMap 中已经不存在 window 对象。

规范

Specification
ECMAScript® 2025 Language Specification
# sec-weakmap.prototype.delete

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
delete

Legend

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Full support
Full support
See implementation notes.

参见