object

 1 var obj = {};
 2 obj.name = ‘Kate‘;
 3 var obj = {name:‘Jerrt‘};
 4 
 5 var obj = new Object();
 6 
 7 Object.defineProperty(obj,‘age‘,{
 8 　　configurable: //是否可配置、删除、修改；默认是false
 9 　　writable: //是否可编辑 若config是false writable无意义
10 　　enumerable: //是否可枚举
11 　　value: //属性对应的value值
12 　　get、set: //此两项不能和writable、value同时出现
13 })

1 function Person(name,age){
 2 this.age = age;
 3 this.name = name;
 4 }
 5 Person.prototype = {
 6     eat : function(food){
 7         console.log(this.name + ‘爱吃‘ + food);
 8     },
 9     sleep : function(){
10         console.log(this.name + ‘每天睡觉8小时‘);
11     }
12 }
13 Person.prototype.constructor = Person;
14 
15 var jack = new Person(‘jack‘,18);
16 jack.eat(‘蛋炒饭‘);
17 
18 function Student(name,age){
19     Person.call(this,name,age);
20 }
21 
22 Student.prototype = Object.create(Person.prototype);
23 Student.prototype.constructor = Student;
24 var mike = new Student(‘mike‘,19);
25 mike.eat = function(‘冰淇淋‘){
26     console.log(‘冰淇淋‘)
27 };