????function?fun_1(){
????????this.name?=?"jiao";
????}
????function?fun_2(){
????????this.age?=?99;
????}
????fun_2.prototype?=?new?fun_1();
????var?obj?=?new?fun_1();
????alert(obj.age);請問代碼中fun_1繼承了fun_2還是fun_2繼承了fun_1？如何判斷？
javascript原型鏈？
慕先生4543078
2017-04-07 00:11:51
