js精简写倒计时函数

<div class="fRight mR10" id="time">  </div>

<script type="text/javascript">
    window.onload=function (){
        setInterval("document.getElementById('time').innerHTML=new Date().toLocaleString()+' 星期'+'日一二三四五六'.charAt(new Date().getDay());",1000);
    }
</script>