js-AOP

aop实现

Function.prototype.before = function (beforefn)
{
    var _self = this;//记录原函数
    return function ()
    {
        beforefn.call(this, arguments);//修正this值
        return _self.apply(this, arguments);
    }
}
Function.prototype.after = function (afterfn)
{
    var _self = this;//
    return function ()
    {
        var ret = _self.apply(this, arguments);//修正this值，并且执行原函数
        afterfn.apply(this, arguments);
        return ret;
    }
}