試一試
const weakset = new WeakSet();
const object = {};
weakset.add(object);
console.log(weakset.has(object));
// Expected output: true
weakset.delete(object);
console.log(weakset.has(object));
// Expected output: false
語法
js
weakSetInstance.delete(value)
引數
返回值
如果 WeakSet 物件中的某個項已成功移除，則返回 true。如果未找到該項，則返回 false。如果 value 不是物件或 未註冊的 Symbol，則始終返回 false。
示例
使用 delete()
js
const ws = new WeakSet();
const obj = {};
ws.add(window);
ws.delete(obj); // Returns false. No obj found to be deleted.
ws.delete(window); // Returns true. Successfully removed.
ws.has(window); // Returns false. The window is no longer present in the WeakSet.
規範
| 規範 |
|---|
| ECMAScript® 2026 語言規範 # sec-weakset.prototype.delete |
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