javascript判断文件是否存在
1. 客户端
<script language="javascript">function FileExist(){ var sfso=new ActiveXObject("Scripting.FileSystemObject"); var fPath="[The path of the file]"; if(sfso.FileExists(fPath)) { alert("Exist"); } else { alert("Doesn't exist"); }}</script> <script language="javascript">function FileExist(){ var xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); xmlhttp.open("GET",FileURL,false); xmlhttp.send(); if(xmlhttp.readyState==4) { if(xmlhttp.status==200) alert("Exist"); else if(xmlhttp.status==404) alert("Doesn't exist"); else alert("Don't know"); } }</script>