JavaScript的weakSet.delete()方法用法介绍 _JavaScript

以下是示例weakSet.add()方法。

< script> function gfg() { const A = new WeakSet(); const B = {}; A. delete (B); document.write(A.has(B) + "< br> " ); } gfg(); < /script>

输出如下：false
weakSet.delete()是JavaScript中的内置函数, 用于从列表中删除特定元素弱集目的。
【JavaScript的weakSet.delete()方法用法介绍】语法如下：

weakSet.delete(A);

参数：它接受参数" A", 该参数是将从弱集对象中删除的值。
返回值：如果已成功从弱集对象中删除了元素, 则返回true；如果尚未成功删除该元素或在弱集中找不到该元素, 则返回false。
JavaScript代码显示此功能的工作方式：
代码1：

< script> //Constructing weakSet() object const A = new WeakSet(); //Creating a new element const B = {}; //Adding the element to the weakset object A.add(B); //Testing whether the element has been //set into the weakset object or not document.write(A.has(B) + "< br> " ); //Deleting B form the weakSet() object A. delete (B); //Testing whether the element "B" has been deleted or not document.write(A.has(B) + "< br> " ); < /script>

输出如下：