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<script>
        function Persion(name, age) {
            this.name = name;
            this.age = age;
　　　　　　//在構(gòu)造函數(shù)里定義方法
            this.sing = function () {
                console.log("I can sing");
            }
        }
        var p1 = new Persion("jack", 12);
        var p2 = new Persion("tom", 13);
        console.log(p1.sing === p2.sing);//false





        function Persion2(name, age) {
            this.name = name;
            this.age = age;
        }
　　　　//在構(gòu)造函數(shù)的原型對(duì)象里定義方法
        Persion2.prototype.sing = function () {
            console.log("I can sing");
        }
        var p3 = new Persion2("jack", 12);
        var p4 = new Persion2("tom", 13);
        p3.sing();//I can sing
        p4.sing();//I can sing 

        console.log(p3.sing === p4.sing);//true
    </script>