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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/WeakSet/delete below:

WeakSet.prototype.delete() - JavaScript | MDN

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

const weakset1 = new WeakSet();
const object1 = {};

weakset1.add(object1);

console.log(weakset1.has(object1));
// Expected output: true

weakset1.delete(object1);

console.log(weakset1.has(object1));
// Expected output: false

weakSetInstance.delete(value)

value

要从 WeakSet 对象中删除的值。

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

const ws = new WeakSet();
const obj = {};

ws.add(window);

ws.delete(obj); // 返回 false。没有找到要删除的对象。
ws.delete(window); // 返回 true。成功删除。

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

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