js delete 用法(删除对象属性及变量)

时间:2021-09-04 14:54:30

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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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