JavaScript weakMap.set()方法用法示例

2021年5月2日18:32:23 发表评论 876 次浏览

以下是示例weakMap.set()方法。

<script> function gfg() { const weakmap1 = new WeakMap(); const key1 = {}; const key2 = {}; const key3 = {}; weakmap1.set(key1, 'G' ); weakmap1.set(key2, 'F' ); weakmap1.set(key3, 'G' ); document.write(weakmap1.get(key1) +weakmap1.get(key2) +weakmap1.get(key3)); } gfg(); </script>

输出如下: GFG

weakMap.set()是JavaScript中的内置函数, 用于为WeakMap对象设置具有特定键和值的新元素。

语法如下:

weakMap.set(key, value);

参数:它接受参数" key", 这是要设置为WeakMap对象的元素的键, 而参数" value"是要设置为WeakMap对象的元素的值。

返回值:它返回WeakMap对象。

例子:

Input: weakmap1.get(key1)
Output: lsbin

JavaScript代码显示此功能的工作方式:

代码1:

<script> 
  
     //creating WeakMap() object
     const weakmap1 = new WeakMap();
      
     //Creating some keys
     const key1 = {};
     const key2 = {};
  
     //Setting key and value to the object.
     weakmap1.set(key1, 'lsbin' );
     weakmap1.set(key2, 'gfg' );
  
    //Returning the set values
    document.write(weakmap1.get(key1) + "<br>" );
    document.write(weakmap1.get(key2));
  
</script>

输出如下:

lsbin
gfg

代码2:

<script> 
  
     //creating WeakMap() object
     const weakmap1 = new WeakMap();
      
     //Creating some keys
     const key1 = {};
     const key2 = {};
     const key3 = {};
     const key4 = {};
     const key5 = {};
     const key6 = {};
  
     //Setting key and value to the object.
     weakmap1.set(key1, 'lsbin' );
     weakmap1.set(key2, 'gfg' );
     weakmap1.set(key3, 'GfG is a cse portal' );
     weakmap1.set(key4, '12345' );
     weakmap1.set(key5, '@#$%' );
     weakmap1.set(key6, '1.34' );
  
    //Returning the set values
    document.write(weakmap1.get(key1) + "<br>" );
    document.write(weakmap1.get(key2) + "<br>" );
    document.write(weakmap1.get(key3) + "<br>" );
    document.write(weakmap1.get(key4) + "<br>" );
    document.write(weakmap1.get(key5) + "<br>" );
    document.write(weakmap1.get(key6));
  
</script>

输出如下:

lsbin
gfg
GfG is a cse portal
12345
@#$%
1.34

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