注意是用到了、下列的演示
<scriptlanguage = "javascript" type = "text/javascript">
ADTIME = 8;
chancead = 1;
varns =（document.layers）;
varie =（document.all）;
varw3 =（document.getElementById &&！ie）;
adcount = 0;
functionItad（）{
if（！ns &&！ie &&！w3）return;
if（ie）addiv = eval（ 'document.all.sponsoraddiv.style'）;
elseif（ns）addiv = eval（ 'document.layers ["sponsoraddiv"]'）;
elseif（w3）addiv = eval（ 'document.getElementbyId（ "sponsoraddiv"）。style'）;
randad = math.ceil（math.random（）*chancead）;
if（ie || w3）
addiv.visibility = "visible";
それ以外
addiv.visibility = "show";
if（randad == 1）showad（）;
}
functionshowad（）{
if（adcount <adtime*10）{adcount+= 1;
if（ie）{documentwidth = document.body.offsetwidth/2+document.body.scrollleft-20;
documentheight = document.body.offseetheight/2+document.body.scrolltop-20;}
elseif（ns）{documentwidth = window.innerwidth/2+window.pagexoffset-20;
documentheight = window.innerheight/2+window.pageyoffset-20;}
elseif（w3）{documentwidth = self.innerwidth/2+window.pagexoffset-20;
documentheight = self.innerheight/2+window.pageyoffset-20;}
addiv.left = documentwidth-100; addiv.top = documentheight-0;
setimeout（ "showad（）"、100）;}
}
functionclosead（）{
if（ie || w3）
addiv.display = "none";
それ以外
addiv.visibility = "hide";
}
function $（obj）{
returnDocument.getElementById（OBJ）;
}
functioncheckform（）{
if（$（ "file1"）。value！= ""）
{
if（/jpg|jpeg|gif|bmp/i.test（$（ "file1"）。value.match（//.(/ w+）$/）[0] == false）{
アラート（ "您只能上传图片文件"）;