JS (javascript) 计算循环当前时间，javascript 时间钟表

 <p class="" id="c_nowTime">加载中~</p>

setInterval(() => {
        var timespan = document.querySelectorAll('#c_nowTime');
          var now = new Date();
          var nh = now.getHours();
          var nm = now.getMinutes();
          var ns = now.getSeconds();
          if (nh < 10) nh = '0' + nh;
          if (nm < 10) nm = '0' + nm;
          if (ns < 10) ns = '0' + ns;
          [].forEach.call(timespan, function (v) {
            v.innerHTML = '时间：' + nh + ":" + nm + ':' + ns;
        });
      }, 1000);

简单的 JS 当前时间