转自：https://www.jb51.net/article/54247.htm
1,对象属性删除
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function fun(){this.name = 'mm';}var obj = new fun();console.log(obj.name);//mmdelete 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 |