输入框：输入速度和是否为删除、增加

var lastInput = {
    d: "",
    flag: true,
    timeContainer:0,
    test: function (str) {
        if (str - this.d > 0) {
            this.flag = true;
        } else {
            this.flag = false;
        }
        this.d = str;
        return this.flag;
    },
    twoClickFast:function(){
        var nowTime =  (new Date()).getTime();;
        var f = (nowTime - this.timeContainer) < 600 ? true : false;
        this.timeContainer = nowTime;
        return f;
    }
}