js delete 用法(删除对象属性及变量)

1,对象属性删除

 
         function fun(){
        
         this.name = 'mm';
        
         }
        
         var obj = new fun();
        
         console.log(obj.name);//mm
        
         delete obj.name;
        
         console.log(obj.name); //undefined

2,变量删除

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         var 
          name = 
         'lily'
         ;
        
         delete 
          name;
        
         console.log(name); 
         //lily

直接用delelte删除不了变量

3,删除不了原型链中的变量

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         fun.prototype.age = 18;
        
         delete 
          obj.age;
        
         console.log(obj.age) 
         //18

js delete 用法(删除对象属性及变量)

浏览过的版块