关注我们

Javascript 中的 delete()函数

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。

链接：https://www.learnfk.comhttps://www.learnfk.com/javascript/javascript-weakmap-delete-method.html

来源：LearnFk无涯教程网

复制代码

<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

祝学习愉快！(内容编辑有误？请选中要编辑内容 -> 右键 -> 修改 -> 提交！)

技术教程推荐

好记忆不如烂笔头。留下您的足迹吧 :)