function testPrototype2(){  function Person3(name, age, job){    this.name=name;    this.age=age;    this.job=job;    this.friends =["shelb", "court"];  }  Person3.prototype = {    constructor:Person3,    sayName:function(){      alert(this.name);    }  }  var person1 = new Person3("jack",10,"it");  var person2 = new Person3("karry",1,"woker");  person1.friends.push("tom");  console.info(person1.friends);  console.info(person2.friends);  console.info(person1.friends==person2.friends);  console.info(person1.sayName == person2.sayName);}