function Student(id,name){
this.id = id;
this.name = name;
this.eat = function(food){
console.log("吃"+food);
return this;
},
this.sleep = function(){
console.log("睡");
}
var stu =new Student(1001,"张三");
stu.eat("").sleep().eat("").sleep().eat("").sleep().eat("").sleep();
//链式编程 jqerry同理