jquery实现倒计时和当前时间的显示

<script type="text/javascript"
src="${pageContext.request.contextPath}/js/jquery-1.4.3.js">
</script>
<script type="text/javascript">
var second = 4;
var timer ;
$(function() {
$('#time').html(currentTime);
timer = window.setInterval(function(){
if (second <= 0) {
location.href = "${pageContext.request.contextPath}";
} else {
$("#totalSecond").html(second--);
}
}, 1000);
var displayTime = window.setInterval(function(){
$('#time').html(currentTime)
},1000);
});
function cancel(){
window.clearInterval(timer);
}
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;
}

</script>

jsp页面

<span style="color: green"><span id="totalSecond">5</span>
秒后自动跳转至当当商城</span>
<a href="javascript:;" onclick="cancel();" style="color: red">取消</a>

<span style="color:green">当前时间<span id="time"></span></span>