首页 > 代码库 > JS之原型对象

JS之原型对象

1.__proto__

每个对象都有一个__proto__属性,指向该对象的原型对象

<script>        var person = function(name,city){            this.name = name;            this.city =city;           }        person.prototype.showName = function(){            return this.name;           }        var p = new person(pmx,shanghai);        console.log(p.__proto__ == person.prototype);</script>

2.isPrototypeOf(obj)用来判断当前对象是否是obj的原型对象

<script>      var person = function(name,city){            this.name = name;            this.city =city;           }        person.prototype.showName = function(){            return this.name;           }        var p = new person(pmx,shanghai);        console.log(person.prototype.isPrototypeOf(p));</script>

3.getPrototypeOf(obj)得到obj的原型对象

<script>      var person = function(name,city){            this.name = name;            this.city =city;           }        person.prototype.showName = function(){            return this.name;           }        var p = new person(pmx,shanghai);        console.log(Object.getPrototypeOf(p) == person.prototype);</script>

 

JS之原型对象