js
Date.prototype.format = function (fmt) {
var o = {
"y+": this.getFullYear, //年
"M+": this.getMonth() + 1, //月份
"d+": this.getDate(), //日
"h+": this.getHours(), //小时
"m+": this.getMinutes(), //分
"s+": this.getSeconds() //秒
};
if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
for (var k in o)
if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
return fmt;
}
setInterval("if(document.getElementById('dateTime')){document.getElementById('dateTime').innerHTML = (new Date()).format('yyyy-MM-dd hh:mm:ss')};", 1000);//动态显示时间
html
<html><lable id="dateTime"></lable></html>
标签：动态显示,fmt,JS,substr,length,时间,RegExp From： https://www.cnblogs.com/ThisYbc/p/17150247.html