构造函数<创建函数>

function teacher (name,age,type){

    this.name = name;

    this.age = age;

    this.type = type;

}

var student ={

    name:"zhangsan",

    age : 20,

    hobby :["体育","阅读","游戏"]

}

alert(student.name);

alert(student.hobby);

alert(student.teacher.name);