js delete 用法(刪除物件屬性及變數)

1,物件屬性刪除

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

2,變數刪除

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

直接用delelte刪除不了變數

3,刪除不了原型鏈中的變數刪除不符屬性及變數)相關文章請關注PHP中文網！