JS:继承

function Box(){          //Box()构造函数
                     this.name = "lee";
                 }

                 function Desk(){        //Desk()构造函数
                     this.age = 100;
                 }

                 Desk.prototype = new Box();  //通过原型Desk()继承了Box()
                 Desk.prototype.age = 200;//对应第255行
                 

                 var desk = new Desk();
                 alert(desk.age);
                 alert(desk.name); //undefind, 对应第220行

                 function Table(){
                     this.level = "cccc";
                 }

                 Table.prototype = new Desk();


                 var table = new Table();
                 alert(table.name);

function Box(age){
                     this.name = ["ll","cc","kk"];
                     this.age = age;
                 }

                 Box.prototype.run = function(){
                     return this.name + this.age;
                 }

                 function Desk(age){
                     Box.call(this,age);//this表示Desk. 对象冒充，给父类传参，解决了传参问题
                 }

                 Desk.prototype = new Box(); //原型链继承，解决了共享问题

                 var desk = new Box(120);
                 //alert(desk.age);//20
                 //alert(desk.name); //llcckk
                 desk.name.push("00");
                 //alert(desk.name); //llcckk00
                 alert(desk.run());