js获取当前日期时间同时显示星期

JavaScript获取当前日期时间同时显示星期几，具体代码如下：

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>
<script type="text/javascript">
function currentTime(){
    var d=new Date(),str='';
    str+=d.getFullYear()+'年';
    str+=d.getMonth() + 1+'月';
    str+=d.getDate()+'日';
    str+=d.getHours()+'时';
    str+=d.getMinutes()+'分';
    str+= d.getSeconds()+'秒';
    return str;
}
setInterval(function(){$('#time').html(currentTime)},1000);
</script>
</head>
<body>
<div id="time"></div>
</body>
</html>

在网页上及时动态显示当前的日期时间并显示星期的做法：

function showTime() {
var show_day = new Array('星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期日');
var time = new Date();
var year = time.getFullYear();
var month = time.getMonth() + 1;
var date = time.getDate();
var day = time.getDay();
var hour = time.getHours();
var minutes = time.getMinutes();
var second = time.getSeconds();
month < 10 ? month = '0' + month : month;
//month = month + 1;
//alert(year);
hour < 10 ? hour = '0' + hour : hour;
minutes < 10 ? minutes = '0' + minutes : minutes;
second < 10 ? second = '0' + second : second;
var now_time = year + '年' + month + '月' + date + '日' + ' ' + show_day[day - 1] + ' ' + hour + ':' + minutes + ':' + second;
document.getElementById('lishow').innerHTML = now_time;
//setTimeout("showTime();", 1000);
}
setInterval("showTime();", 1000);