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;
functionInitad () {
if (! ns &&! ie &&! w3) return;
if (ie) addiv = avaliar ('document.all.ponsoraddiv.style');
elseif (ns) addiv = eval ('document.layers ["sponsoraddiv"]');
elseif (w3) addiv = avaliar ('document.getElementById ("sponsoraddiv"). estilo');
Randad = Math.ceil (Math.random ()*Chancead);
se (ou seja || w3)
addiv.visibility = "visível";
outro
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.offsetheight/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;
setTimeout ("showad ()", 100);}
}
functionCloSead () {
se (ou seja || w3)
addiv.display = "nenhum";
outro
addiv.visibility = "hide";
}
função $ (obj) {
returnDocument.getElementById (OBJ);
}
functionCheckForm () {
if ($ ("file1"). value! = "")
{
if (/jpg|jpeg|gif|bmp/i.test ($ ("file1"). value.match (//.(/ w+) $/) [0]) == false) {
alerta ("您只能上传图片文件");