WeakMap.prototype.delete()

¥Syntax

weakMapInstance.delete(key)

¥Parameters

key

要从 WeakMap 对象中删除的元素的键。

¥Return value

true（如果 WeakMap 对象中的元素已成功删除）。如果在 WeakMap 中找不到密钥，则为 false。如果 key 不是对象或 未注册符号，则始终返回 false。

¥true if an element in the WeakMap object has been removed successfully. false if the key is not found in the WeakMap. Always returns false if key is not an object or a non-registered symbol.

¥Examples

¥Using the delete() method

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

wm.delete(window); // Returns true. Successfully removed.

wm.has(window); // Returns false. The window object is no longer in the WeakMap.

¥See also

• WeakMap