<input type="file" id="fileText">
<input type="button" value="检查文件大小" 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");//获取上传文件的对象
var file = fileobject.GetFile (document.getElementById("fileText").value);//获取上传的文件
var filesize = file.Size;//文件大小
}
alert(filesize);
}
</script>
<script language="JavaScript">
<!--
function ShowSize(files)
{
var fso,f;
fso=new ActiveXObject("Scripting.FileSystemObject");
f=fso.GetFile(files);
var fileSize = f.size ;
if((fileSize/1024) < 1024){
alert(fileSize/1024+"K");
}else if( ((fileSize/1024) > 1024) && ((fileSize/(1024*1024)) < 1024)){
alert(fileSize/(1024*1024)+"M");
}else{
alert(fileSize/(1024*1024*1024)+"G")
}
}
//-->
</script>
<input type="text" size="4" value="10" name="filesizelimit" id="filesizelimit"/> k
<input type="file" name="file1" id="file1" size="40" onchange="changesrc(this)"/>
<img src="about:blank" id="filechecker" alt="test" height="18"/>
<script type="text/javascript">
var ofilechecker = document.getelementbyid("filechecker");
function changesrc(filepicker)
{
ofilechecker.src = filepicker.value;
}
ofilechecker.onreadystatechange = function ()
{
if (ofilechecker.readystate == "complete")
{
checksize();
}
}
function checksize()
{
var limit = document.getelementbyid("filesizelimit").value * 1024;
if (ofilechecker.filesize > limit)
{
alert("too large");
}
else
{
alert("ok");
}
}
</script>
<script type="text/javascript">
function getFileSize(filePath)
{
var image=new Image();
image.dynsrc=filePath;
alert(image.fileSize);
}
</script>
<body>
<INPUT TYPE="file" NAME="file" SIZE="30" onchange="getFileSize(this.value)">
</body>
