javascript—创建对象的三种方式/正则表达式/通配符

function Student(id,name){
    this.id=id;
    this.name=name;
    this.eat=function(food){
        console.log("吃"+food); //吃米饭
        return this //返回的是stu
    },
    this.sleep=function(){
        console.log("睡"); 
        return this //返回的是stu
   }
}
// 用stu调用
var stu=new Student(1001,"张三"); //谁调用返回谁
stu.eat("");
stu.sleep();
stu.eat("").sleep().eat("").sleep().eat("").sleep();