JS得到图片的尺寸解决方案 - ActiveXObject

[java]代码库

<input type="file" id="fileText">    
<input type="button" value="getSize" onclick="checkFileChange(document.getElementById('fileText'));">   
  
  
<script type="text/javascript">   
var  Sys = {};   
if(navigator.userAgent.indexOf("MSIE")>0)   
{   
    Sys.ie=true;   
}   
if(isFirefox=navigator.userAgent.indexOf("Firefox")>0)   
{   
    Sys.firefox=true;   
}   
  
function checkFileChange(obj)   
{   
    var filesize = 0;   
       
    if(Sys.firefox)   
    {   
        filesize = obj.files[0].fileSize;   
    }else if(Sys.ie)   
    {   
        var fileobject = new ActiveXObject ("Scripting.FileSystemObject");
        var file = fileobject.GetFile (document.getElementById("fileText").value);
        var filesize = file.Size;
    }   
    alert(filesize);   
}   
</script> //源代码片段来自云代码http://yuncode.net