js 显示日期时间的实例(时间过一秒加1)

<div id="data"><font>2017年10月17日 15:11:11</font></span> 

function showLocale(objD) {   var str, colorhead, colorfoot;   var yy = objD.getYear();   if (yy < 1900) yy = yy + 1900;  var MM = objD.getMonth() + 1;   if (MM < 10) MM = '0' + MM;  var dd = objD.getDate();   if (dd < 10) dd = '0' + dd;  var hh = objD.getHours();   if (hh < 10) hh = '0' + hh;  var mm = objD.getMinutes();   if (mm < 10) mm = '0' + mm;  var ss = objD.getSeconds();   if (ss < 10) ss = '0' + ss;  var ww = objD.getDay();   if (ww == 0) colorhead = "";  if (ww > 0 && ww < 7) colorhead = "";str = colorhead + yy + "年" + MM + "月" + dd + "日 " + hh + ":" + mm + ":" + ss + " ";return (str);}function tick() {var today;today = new Date();document.getElementById("new_data").innerHTML = showLocale(today);window.setTimeout("tick()", 1000);}tick();