我想将如下代码写入js文件

                <script>
var day="";
var month="";
var ampm="";
var ampmhour="";
var myweekday="";
var year="";
mydate=new Date();
myweekday=mydate.getDay();
mymonth=mydate.getMonth()+1;
myday= mydate.getDate();
myyear= mydate.getYear();
year=(myyear > 200) ? myyear : 1900 + myyear;
if(myweekday == 0)
weekday="&nbsp;星期天";
else if(myweekday == 1)
weekday="&nbsp;星期一 ";
else if(myweekday == 2)
weekday="&nbsp;星期二";
else if(myweekday == 3)
weekday="&nbsp;星期三";
else if(myweekday == 4)
weekday="&nbsp;星期四";
else if(myweekday == 5)
weekday="&nbsp;星期五";
else if(myweekday == 6)
weekday="&nbsp;星期六";
document.write(year+"年"+mymonth+"月"+myday+"日"+weekday);
                </script>

然后在页面上调用,应该如何写