JS输出当前时间，且每秒变化

1 <div ></div>
2 <script type="text/javascript">
3 window.setInterval(function(){
4     var _date = new Date(); document.getElementById('timer').innerHTML = _date.toLocaleString() + ' 星期' + '日一二三四五六'.charAt(_date.getDay());
5 }, 1000);
6 </script>