window.onload=function() {showTime();}
function checkTime(i){
if(i<10){i="0"+i}
return i;
}
function showTime() {
var now = new Date();
var year = now.getFullYear();
var month = now.getMonth() + 1;
var date = now.getDate();
var d = now.getDay();
var h = now.getHours();
var m = now.getMinutes();
var s = now.getSeconds();
m=checkTime(m);
s=checkTime(s);
var weekday = new Array(7);
weekday[0] = "星期日"
weekday[1] = "星期一"
weekday[2] = "星期二"
weekday[3] = "星期三"
weekday[4] = "星期四"
weekday[5] = "星期五"
weekday[6] = "星期六"
document.getElementById('show').innerHTML = year + "年" + month + "月" + date + "日" + " " + weekday[d] + " " + h + ":" + m + ":" + s;
t=setTimeout(showTime,500);
}
<div class="content1">
<div id="show">显示时间的位置</div>
</div>
