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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>
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原文地址：http://www.cnblogs.com/bibiafa/p/5867860.html
