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…
