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<input type="file" name="file1" onchange="checkimage
(value)">
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<script language="javascript">
var img=null;
function checkimage(name){
if(/^.+\.(gif|jpg|png)$/i.test(name))
{
if(img)img.removeNode(true);
img=document.createElement("img");
img.style.position="absolute";
img.style.visibility="hidden";
img.attachEvent("onerror",oe);
img.attachEvent("onreadystatechange",orsc);
document.body.insertAdjacentElement("beforeend",img);
img.src=name;
}
else{oe()}
}
function oe(){
form1.reset();
alert("ÎļþÀàÐÍÖ»ÄÜÊÇ<gif><jpg><png>!");
}
function orsc(){
if (img.fileSize>51200){
form1.reset();
alert("Îļþ´óС²»Äܳ¬¹ý50K!");
}
}
</script>
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http://lmgq.vip.sina.com/tech/jsadvancedlesson/c2p1.htm
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2004-9-21 14:43:00
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function trim(s){
return s.replace(/^\s+|\s+$/g, '');
}
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function trim(str) {
str = str.replace(/^\s+/g, '');
for(var i = str.length - 1; i >= 0; i--){
if(!/^\s$/.test(str.substr(i,1) ......