currentTime= 180 //要换算的总秒数
th = parseInt(currentTime/ 3600);
ti = parseInt((currentTime- th * 3600) / 60);
ts = parseInt(currentTime- th * 3600 - ti * 60);
if (th < 10) {
th = '0' + th;
}
if (ti < 10) {
ti = '0' + ti;
}
if (ts < 10) {
ts = '0' + ts;
}
console.log(th, ti, ts)