javascript里的继承

js里面继承的方式，

1. 类式继承，通过构造函数的继承

 1 function extend(subClass, superClass){
 2     var F = function(){};
 3     F.prototype = superClass.prototype;
 4     subClass.prototype = new F();
 5     subClass.prototype.constructor = subClass;
 6
 7     subClass.superclass = superClass.prototype; // optional
 8     if (superClass.prototype.constructor == Object.prototype.constructor){
 9         superClass.prototype.constructor = superClass;
10     }
11 }

2. 原型式继承，通过对象的继承

function clone(object){
    function F(){}
    F.prototype = object;
    return new F();
}

javascript里的继承