仿百度ting 搜索条件为空 效果

//el   :input text

//num: 次数

//time:毫秒数

//class: bling 就是那个粉红色背景的样式

bling: function (el, num, time) {
        num = num === 0 ? num : num || 3;
        time = time || 150;
        $(el).toggleClass("bling");
        if (num < -1) {
            $(el).removeClass("bling");
            return false;
        } else {
            num--;
            setTimeout(function () {
                bling(el, num, time);
            }, time);
        }
    }