js delete 用法(删除对象属性及变量)

1,对象属性删除

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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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varname = 'lily';

deletename;

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;

deleteobj.age;

console.log(obj.age)//18