JavaScript weakMap.delete()方法用法示例 _JavaScript

以下是示例weakMap.delete()方法。

< script> function gfg() { const weakmap = new WeakMap(); const key = {}; weakmap.set(key, 6); document.write(weakmap. delete (key)); } gfg(); < /script>

【JavaScript weakMap.delete()方法用法示例】输出如下： true
weakMap.delete()是JavaScript中的内置函数, 用于从对象WeakMap中删除特定元素。
语法如下：

weakMap.delete(key);

参数：它接受参数" key", 它是要从对象weakMap中删除的元素的键。
返回值：如果该元素已从weakMap对象中删除, 则返回true；如果该键不存在于weakMap对象中, 则返回false。
例子：

Input: weakmap1.delete(key1) Output: true

JavaScript代码显示此功能的工作方式：
代码1：

< script> //Creating a WeakMap() object const weakmap1 = new WeakMap(); //Creating a key "key1" const key1 = {}; //Setting the value 6 with key1 to the //the end of weakMap object weakmap1.set(key1, 6); //Deleting key of the element from //the weakMap object document.write(weakmap1. delete (key1)); < /script>

输出如下：

true

此处输出为true, 表示元素的键已成功删除。
代码2：

< script> //Creating a WeakMap() object const weakmap1 = new WeakMap(); //Creating a key "key1" const key1 = {}; //Deleting key of the element from //the weakMap object document.write(weakmap1. delete (key1)); < /script>

输出如下：