01. “HH:MM:SS"时间与秒数互转 效果如下： hmsToSeconds('12:33:06'); // 45186 secondsToHms(45186); // "12:33:06" 参考： date - Convert seconds to HH-MM-SS with JavaScript? - Stack Overflow time - Convert HH:MM:SS string to seconds only in javascript - Stack Overflow 继续&