下面的代码哪里有问题, 为什么不论用什么浏览器总要卡住的? 求解

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卡住是什么意思？执行一会就不动了？IE点击右键时 setInterval 就暂停执行了
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function showClock()
{var d = new Date();
var weekday;
var month;
var dateth;
var hours;
var minutes;
var seconds;
switch (d.getDay())
{
case 0:
weekday="Sunday  ";
case 1:
weekday="Monday  ";
case 2:
weekday="Tuesday  ";
case 3:
weekday="Wednesday  ";
case 4:
weekday="Thursday  ";
case 5:
weekday="Friday  ";
case 6:
weekday="Saturday  ";
}
if(d.getHours() < 10)
hours = "0" + d.getHours();
else
hours ="" + d.getHours();
if(d.getMinutes()<10)
minutes="0" + d.getMinutes();
else
minutes = "" + d.getMinutes();
if(d.getSeconds() < 10)
seconds = "0" + d.getSeconds();
else
seconds = "" + d.getSeconds();switch(d.getMonth())
{
case 0:
month = "January";
case 1:
month = "February";
case 2:
month = "March";
case 3:
month = "April";
case 4:
month = "May";
case 5:
month = "June";
case 6:
month = "July";
case 7:
month = "August";
case 8:
month = "September";
case 9:
month = "October";
case 10:
month = "November";
case 11:
month = "December";
}switch (d.getDate())
{
case 1:
dateth = d.getDate() + "st";
case 2:
dateth = d.getDate() + "nd";
case 3:
dateth = d.getDate() + "rd";
default:
dateth= d.getDate() + "th";
}
document.getElementById("clock").innerHTML = "" + hours + ":" + minutes + ":" + seconds;document.getElementById("date").innerHTML="" + weekday  + "  "  + month  +"  "+ dateth;
}
window.onload=function(){window.setInterval(showClock, 1000);};
</script>
</head><body>
<div id="clock"></div>
<div id="date"></div>
</body>
</html>
改成这样试试
switch(d.getMonth())
            {
                case 0:
                    month = "January";
                    break;//为了优化不要少了中断循环，说到优化你的代码可以这样写：    <script type="text/javascript">
        window.onload=function(){
            window.setInterval(
                function (){
                    var d = new Date();
                    var week=["Sunday  ","Monday  ","Tuesday  ","Wednesday  ","Thursday  ","Friday  ","Saturday  "];
                    var month=["January","February","March","April","May","June","July","August","September","October","November","December"];
                    var date=["st","nd","rd","th"];
                    document.getElementById("clock").innerHTML = ("0"+d.getHours()).slice(-2) + ":" + ("0"+d.getMinutes()).slice(-2) + ":" + ("0"+d.getSeconds()).slice(-2);
                    document.getElementById("date").innerHTML=week[d.getDay()]  + "  "  + month[d.getMonth()]  +"  "+ d.getDate()+date[d.getDate()>3?3:d.getDate()];
                },1000)
        }
    </script>
function showClock()
{var d = new Date();
var weekday;
var month;
var dateth;
var hours;
var minutes;
var seconds;
switch (d.getDay())
{
case 0:
weekday="Sunday  ";
case 1:
weekday="Monday  ";
case 2:
weekday="Tuesday  ";
case 3:
weekday="Wednesday  ";
case 4:
weekday="Thursday  ";
case 5:
weekday="Friday  ";
case 6:
weekday="Saturday  ";
}
if(d.getHours() < 10)
hours = "0" + d.getHours();
else
hours ="" + d.getHours();
if(d.getMinutes()<10)
minutes="0" + d.getMinutes();
else
minutes = "" + d.getMinutes();
if(d.getSeconds() < 10)
seconds = "0" + d.getSeconds();
else
seconds = "" + d.getSeconds();switch(d.getMonth())
{
case 0:
month = "January";
case 1:
month = "February";
case 2:
month = "March";
case 3:
month = "April";
case 4:
month = "May";
case 5:
month = "June";
case 6:
month = "July";
case 7:
month = "August";
case 8:
month = "September";
case 9:
month = "October";
case 10:
month = "November";
case 11:
month = "December";
}switch (d.getDate())
{
case 1:
dateth = d.getDate() + "st";
case 2:
dateth = d.getDate() + "nd";
case 3:
dateth = d.getDate() + "rd";
default:
dateth= d.getDate() + "th";
}
document.getElementById("clock").innerHTML = "" + hours + ":" + minutes + ":" + seconds;document.getElementById("date").innerHTML="" + weekday  + "  "  + month  +"  "+ dateth;
}
window.setInterval(showClock, 1000);把红色部分移到方法外面去，没有看到LZ调用showClock，而且不应该把定时器放在方法里，不然每执行一次都会添加一个定时器。