时间数字（单位/秒）转换为 时间格式（00:00:00）

　　　　 function showTime(iTimelLength) {
            var str = "";
            var s = parseInt(iTimelLength % 60);
            var m = parseInt(((iTimelLength - s) / 60) % 60);
            var h = parseInt((iTimelLength - s) / 3600);
            str += (h >= 10 ? h + ":" : h > 0 ? "0" + h + ":" : "00:");
            str += (m >= 10 ? m + ":" : m > 0 ? "0" + m + ":" : "00:");
            str += (s >= 10 ? s : s > 0 ? "0" + s : "00");
            $("#txtTimeLength").val(str);  //输出格式：00:00:00
        }

decimal iTimelLength = model.videoTimeLength;
var str = "";
decimal s = Convert.ToDecimal(iTimelLength % 60);
int m = Convert.ToInt32(((iTimelLength - s) / 60) % 60);
int h = Convert.ToInt32((iTimelLength - s) / 3600);
str += (h >= 10 ? h.ToString() + ":" : h > 0 ? "0" + h.ToString() + ":" : "00:");
str += (m >= 10 ? m.ToString() + ":" : m > 0 ? "0" + m.ToString() + ":" : "00:");
str += (s >= 10 ? s.ToString() : s > 0 ? "0" + s.ToString() : "00");
this.txtTimeLength.Text = str;  //输出格式：00:00:00