SOURCE

//类式继承
//声明父类
function superclass(){
    this.superValue = true;
}
//为父类添加共有方法
superclass.prototype.getsuperValue = function(){
    return this.superValue;
};
//声明子类
function subclass(){
    this.subValue = false;
}
//继承父类
subclass.prototype = new superclass();
//为子类添加共有方法
subclass.prototype.getsubValue = function(){
    return this.subValue;
}

var instance = new subclass();
console.log(instance.getsuperValue());
console.log(instance.getsubValue());
console.log(instance.superValue);