输出对象时不输出[object Object]，添加一个toString()方法

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title></title>
  <script type="text/javascript">
   
   function Person(name , age , gender){
    this.name = name;
    this.age = age;
    this.gender = gender;
   }
   //创建一个Person实例
   var per = new Person("孙悟空",18,"男");
   var per2 = new Person("猪八戒",28,"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
   //修改Person原型的toString
   Person.prototype.toString = function(){
    return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";
   };
   
   var result = per.toString();
   console.log("result = " + result);
   //console.log(per.__proto__.__proto__.hasOwnProperty("toString"));
   //console.log(per2);
   //console.log(per);
   
   
  </script>
 </head>
 <body>
 </body>
</html>
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