function Person(name,age,gender){
this.name = name;
this.age =age;
this.gender = gender;
}
//创建一个Person实例
//修改Person原型的toString
Person.prototype.toString = function(){
return "Person[name ="+this.name+",age ="+this.age+",gender = "+this.gender;
}
var per = new Person("孙悟空",18,"男");
var per2 = new Person("猪八戒",18,"男");
//当我们直接在页面中打印一个对象时,事件上是输出的对象的toString()方法的返回值
//如果我们希望在输出对象时不输出[object Object],可以为对象添加一个toString()方法
//Person[name = 孙悟空,age = 18,gender = 男]
// per.toString = function(){
// return “Person[name =”+this.name+",age ="+this.age+",gender = "+this.gender;
// }
var result = per.toString();
console.log("result = "+result);
console.log(per2);
console.log(per);
console.log(per.__proto__.__proto__.hasOwnProperty("toString"));//true