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WeakMap delete()

JavaScript WeakMap delete()方法

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

语法

delete()方法由以下语法表示:
WeakMapObj.delete()

JavaScript WeakMap 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
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