简单的计时器

<div id="time"></div>

window.onload = function(){
    showTime();
    function checkTime(i){
        if(i<10){
            i = "0"+i;
        }
        return i;
    }
    function showTime(){
    var myDate = new Date();
    var year = myDate.getFullYear();
    var month = myDate.getMonth()+1;
    var date = myDate.getDate();
    var week = myDate.getDay();
    var h = myDate.getHours();
    var m = myDate.getMinutes();
    var s = myDate.getSeconds();
    var arr = [‘星期日‘,‘星期一‘,‘星期二‘,‘星期三‘,‘星期四‘,‘星期五‘,‘星期六‘];
    m = checkTime(m);
    s = checkTime(s);
    document.getElementById(‘time‘).innerHTML = year+‘年‘+month+‘月‘+date+‘日‘+arr[week]+‘<br/>‘+h+‘时‘+m+‘分钟‘+s+‘秒‘;
    setTimeout(showTime,500);}
}