时间： "00:00:00s" 这样的格式

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timeToFormat: function(times){
        var hour = "";
        var minute = "";
        var second = "";
        if(times > 0){
            hour = Math.floor(times / 3600);
            if(hour < 10){
                hour = "0" + hour;
            }

            minute = Math.floor((times - 3600 * hour) / 60);
            if(minute < 10){
                minute = "0" + minute;
            }

            second = Math.floor((times - 3600 * hour - 60 * minute) % 60);
            if(second < 10){
                second = "0" + second;
            }
        }
        return { h: hour, m: minute, s: second };
    },

    startTime: function(){
        this.endTime();
        var self = this;
        this.lbl_time.string = "00:00s";
        var time = 0;
        this.timeCallback = function () {
            time++;
            var t = self.timeToFormat(time);
            self.lbl_time.string = t.m + ":" + t.s + "s";
        }
        this.schedule(this.timeCallback, 1);
    },

    endTime: function(){
        if(this.timeCallback){
            this.unschedule(this.timeCallback);
            this.timeCallback = null;
        }
    },