关于时间日常项目中可能会有很多需求，今天就写一个最简单的，将系统时间写入到页面上。直接来看js代码：
<script> ???window.onload=function(){ ???????var Body=document.body; ???????//把获取出的时间封装为一个函数，方便加定时器让其自动循环 ???????function Time(){ ???????????var str=""; ???????????var myTime=new Date(); ???????????var iYear = myTime.getFullYear(); ???????????var iMonth = myTime.getMonth()+1; ???????????var iDate = myTime.getDate(); ???????????var iWeek = myTime.getDay(); ???????????var iHours = myTime.getHours(); ???????????var iMin = myTime.getMinutes(); ???????????var iSec = myTime.getSeconds(); ???????????//getDay是从0开始的，所以要判断星期 ???????????if( iWeek === 0 ) iWeek = ‘星期日‘; ???????????if( iWeek === 1 ) iWeek = ‘星期一‘; ???????????if( iWeek === 2 ) iWeek = ‘星期二‘; ???????????if( iWeek === 3 ) iWeek = ‘星期三‘; ???????????if( iWeek === 4 ) iWeek = ‘星期四‘; ???????????if( iWeek === 5 ) iWeek = ‘星期五‘; ???????????if( iWeek === 6 ) iWeek = ‘星期六‘; ???????????str = iYear+ ‘年‘ +iMonth+‘月‘+iDate+‘日 ‘+iWeek+‘ ‘+ toTwo(iHours)+‘ : ‘+ toTwo(iMin)+‘ : ‘+ toTwo(iSec); ???????????Body.innerHTML=str; ???????} ???????//加定时器，自动循环 ???????setInterval(Time,1000); ???????Time(); ???}; ???//这里对单数0-9的判断，让其前面加0 ???function toTwo ( n ) { ???????return n < 10 ? ?‘0‘ + n : ‘‘ + n; ???}</script>这样就可以了，具体该注意的地方在注释上已经写清楚了。最简单的写法希望对大家有帮助！
原生js获取系统时间
原文地址：https://www.cnblogs.com/web001/p/8137545.html