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<script >
function showimage()

       //IMG1ΪͼƬ¿Ø¼þ»òDiv,File1ΪÉÏ´«Îļþ¿Ø¼þ
document.getElementById("IMG1"). src = document.getElementById("File1").value;
}
</script >
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<input id="File1" runat="server" type="file"  onchange="showimage()"/>
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<script >
function showimage()
  {  
          document.getElementById("IMG1").filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src =
          document.getElementById ("File1").value;
  }
</script >
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<input id="File1" runat="server" type="file"  onchange="showimage()"/>
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<div id="IMG1" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);width:400px;height:200px;" runat="server" src="" /></div>


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JavaScript£ºprototypeÊôÐÔʹÓÃ˵Ã÷

prototype ÊÇÔÚ IE 4 ¼°ÆäÒÔºó°æ±¾ÒýÈëµÄÒ»¸öÕë¶ÔÓÚijһÀàµÄ¶ÔÏóµÄ·½·¨£¬¶øÇÒÌØÊâµÄµØ·½±ãÔÚÓÚ£ºËüÊÇÒ»¸ö¸øÀàµÄ¶ÔÏóÌí¼Ó·½·¨µÄ·½·¨£¡ÕâÒ»µã¿ÉÄÜÌýÆðÀ´»áÓеãÂÒ£¬±ð¼±£¬ÏÂÃæÎÒ±ãͨ¹ýʵÀý¶ÔÕâÒ»ÌØÊâµÄ·½·¨×÷ÒÑϽ²½â£º
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/*Ö»ÄÜÓÃÔÚCSSÎļþÖлòÕßstyle±êÇ©ÖÐ*/
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  1. BtnDel.Attributes.Add("onclick","return confirm('"+"È·ÈÏɾ³ý?"+"')");
  2. linktempDelete.Attributes["onclick"]="javascript:return  confirm('"+"È·ÈÏɾ³ý?"+"');";
  3. privat ......

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String.prototype.Trim=function(){
returnthis.replace(/(^\s*)|(\s*$)/g,"");
}
String.prototype.LTrim=function(){
returnthis.replace(/(^\s*)/g,"");
}
String.prototype.RTrim=function(){
returnthis.replace(/(\s*$)/g,"");
} ......

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function checkImgAddr(url){
var xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("post",url,false);
xmlhttp.send();
if(xmlhttp.readyState==4){
if(xmlhttp.status==404){
return "File Not Exist.";
}else if(xmlhttp.status == 200){
re ......
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