Nodejs根据字符串调用对象方法

参考网站:http://blog.youkuaiyun.com/kiwi_coder/article/details/8592392

var kiwi = {
    name:'kiwi',

    say:function () {
        console.log("my name is" + this.name);
    }
}

kiwi['say']();    // =>  my name is kiwi