JS文件编写及用htm调用

Question

请大虾们帮忙把下面的代码写在aa.JS文件里，然后用一个htm来调用这个aa.js文件，谢谢：
<span id="span_dt_dt" style='border:1px solid black;background-color:#FFFFFF' ></span>
<SCRIPT language=javascript>
function show_student163_time(){
 window.setTimeout("show_student163_time()", 1000);
 BirthDay=new Date("04-01-2012");//改成你的计时日期
 today=new Date();
 timeold=(BirthDay.getTime()-today.getTime());
 sectimeold=timeold/1000
 secondsold=Math.floor(sectimeold);
 msPerDay=24*60*60*1000
 e_daysold=timeold/msPerDay
 daysold=Math.floor(e_daysold);
 e_hrsold=(e_daysold-daysold)*24;
 hrsold=Math.floor(e_hrsold);
 e_minsold=(e_hrsold-hrsold)*60;
 minsold=Math.floor((e_hrsold-hrsold)*60);
 seconds=Math.floor((e_minsold-minsold)*60);
 span_dt_dt.innerHTML=daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒" ;
}
show_student163_time();
</SCRIPT>

Answer 1

<span id="span_dt_dt" style='border:1px solid black;background-color:#FFFFFF' > </span> 
<SCRIPT language=javascript src="test.js"> </SCRIPT>
//test.jsvar show_student163_time=function show_(){ 
window.setTimeout("show_student163_time()", 1000); 
BirthDay=new Date("04-01-2012");//改成你的计时日期 
today=new Date(); 
timeold=(BirthDay.getTime()-today.getTime()); 
sectimeold=timeold/1000 
secondsold=Math.floor(sectimeold); 
msPerDay=24*60*60*1000 
e_daysold=timeold/msPerDay 
daysold=Math.floor(e_daysold); 
e_hrsold=(e_daysold-daysold)*24; 
hrsold=Math.floor(e_hrsold); 
e_minsold=(e_hrsold-hrsold)*60; 
minsold=Math.floor((e_hrsold-hrsold)*60); 
seconds=Math.floor((e_minsold-minsold)*60); 
span_dt_dt.innerHTML=daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒" ; 
} 
show_student163_time();