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>

2. 服务器端

<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>

 

  

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