构造函数忘记new? 看这里看这里
方法一：自调用构造函数
1 function Person(name){ 2 if( !(this instanceof Person)){//一定要放在开头。检查this是否为构造函数的一个实例 3 return new Person(name);//自调用，会通通走一遍，不用担心后面的属性没加上 4 } 5 this.name = name; 6 this.love = true; 7 } 8 Person.prototype.sayHello = function(){ 9 console.log('hi, '+ this.name); 10 } 11 12 var per1 = new Person('wqh'); 13 var per2 = Person('czm'); 14 console.log(per1.name);//wqh 15 console.log(per1.love);//true 16 console.log(per2.name);//wqh 17 console.log(per2.love);//true 18 per1.sayHello();//hi, wqh 19 per2.sayHello();//hi, czm
方法二：使用that
1 function Person(name){ 2 var that = Object.create(Person.prototype);//手工指定原型 3 that.name = name; 4 that.love = true; 5 return that;//返回that 6 } 7 Person.prototype.sayHello = function(){ 8 console.log('hi, '+ this.name); 9 } 10 11 var per1 = Person('wqh'); 12 var per2 = new Person('czm'); 13 console.log(per1.name);//wqh 14 console.log(per1.love);//true 15 per1.sayHello();//hi, wqh 16 console.log(per2.name);//czm 17 console.log(per1.love);//true 18 per2.sayHello();//hi, czm
显然，我更倾向于第一种(*^__^*)
参考《javaScript模式》P47~P49，并稍作修改
