注意是用到了,下列的演示
- <script language="JavaScript" type="text/javascript">
- adTime=8;
- chanceAd=1;
- var ns=(document.layers);
- var ie=(document.all);
- var w3=(document.getElementById && !ie);
- adCount=0;
- function initAd(){
- if(!ns && !ie && !w3) return;
- if(ie) adDiv=eval('document.all.sponsorAdDiv.style');
- else if(ns) adDiv=eval('document.layers["sponsorAdDiv"]');
- else if(w3) adDiv=eval('document.getElementById("sponsorAdDiv").style');
- randAd=Math.ceil(Math.random()*chanceAd);
- if (ie||w3)
- adDiv.visibility="visible";
- else
- adDiv.visibility ="show";
- if(randAd==1) showAd();
- }
- function showAd(){
- if(adCount<adTime*10){adCount+=1;
- if (ie){documentWidth =document.body.offsetWidth/2+document.body.scrollLeft-20;
- documentHeight =document.body.offsetHeight/2+document.body.scrollTop-20;}
- else if (ns){documentWidth=window.innerWidth/2+window.pageXOffset-20;
- documentHeight=window.innerHeight/2+window.pageYOffset-20;}
- else if (w3){documentWidth=self.innerWidth/2+window.pageXOffset-20;
- documentHeight=self.innerHeight/2+window.pageYOffset-20;}
- adDiv.left=documentWidth-100;adDiv.top =documentHeight-0;
- setTimeout("showAd()",100);}
- }
- function closeAd(){
- if (ie||w3)
- adDiv.display="none";
- else
- adDiv.visibility ="hide";
- }
- function $(obj){
- return document.getElementById(obj);
- }
- function checkForm(){
- if($("file1").value != "")
- {
- if(/jpg|jpeg|gif|bmp/i.test($("file1").value.match(/\.(\w+)$/)[0]) == false){
- alert("您只能上传图片文件");
- return false;
- }
- else
- {
- return true;
- }
- }
- else
- {
- alert("您还没有选中需要上传的图片");
- return false;
- }
- }