无涯教程-Javascript - delete()函数 JavaScript WeakMap delete()方法用

JavaScript WeakMap delete()方法用于从 WeakMap 对象中删除指定的元素。

delete - 语法

delete()方法由以下语法表示:

WeakMapObj.delete()

delete - 方法示例

让我们看一个确定WeakMap对象是否包含指定元素的示例。

<script>
var wm = new WeakMap();
var obj1 = {};
var obj2 = {};
var obj3= {};
wm.set(obj1, jQuery);
wm.set(obj2, AngularJS);
wm.set(obj3,Bootstrap);
document.writeln("Element present before invoking delete() method: "+ wm.has(obj1)+"<br>");
wm.delete(obj1);
document.writeln("Element present after invoking delete() method: "+wm.has(obj1)); 
</script>

输出:

Element present before invoking delete() method: true
Element present after invoking delete() method: false

无涯教程-Javascript - delete()函数

delete - 语法

delete - 方法示例

参考链接