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js delete usage (delete object properties and variables)

高洛峰
Release: 2017-01-20 10:46:01
Original
1634 people have browsed it

1, Object attribute deletion

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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

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2, Variable deletion

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var name = 'lily';

delete name;

console.log(name); //lily

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You cannot delete variables directly with delelte

3. The variables in the prototype chain cannot be deleted

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fun.prototype.age = 18;

delete obj.age;

console.log(obj.age) //18

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