$(document).ready(function(){
$.extend({
show:function(){
}
});
setInterval("show()",1000);
});
function show(){
var myDate = new Date();
var month = myDate.getMonth()+1;
var day = myDate.getDate();
var Hours = myDate.getHours();
var Minutes = myDate.getMinutes();
var Seconds = myDate.getSeconds();
if(month<10){
month = ‘0‘+month
}
if(day<10){
day = ‘0‘+day
}
if(Hours<10){
Hours = ‘0‘+Hours
}
if(Minutes<10){
Minutes = ‘0‘+Minutes
}
if(Seconds<10){
Seconds = ‘0‘+Seconds
}
var time = myDate.getFullYear()+‘-‘+month+‘-‘+day+‘ ‘+Hours+‘:‘+Minutes+‘:‘+Seconds
$(‘#time‘).html(time);
}
var myDate = new Date();//获取系统当前时间
1 myDate.getYear(); //获取当前年份(2位) 2 myDate.getFullYear(); //获取完整的年份(4位,1970-????) 3 myDate.getMonth(); //获取当前月份(0-11,0代表1月) 4 myDate.getDate(); //获取当前日(1-31) 5 myDate.getDay(); //获取当前星期X(0-6,0代表星期天) 6 myDate.getTime(); //获取当前时间(从1970.1.1开始的毫秒数) 7 myDate.getHours(); //获取当前小时数(0-23) 8 myDate.getMinutes(); //获取当前分钟数(0-59) 9 myDate.getSeconds(); //获取当前秒数(0-59) 10 myDate.getMilliseconds(); //获取当前毫秒数(0-999) 11 myDate.toLocaleDateString(); //获取当前日期 12 var mytime=myDate.toLocaleTimeString(); //获取当前时间 13 myDate.toLocaleString( ); //获取日期与时间
原文：https://www.cnblogs.com/chentailin/p/9577785.html