http://hi.baidu.com/vivicode/blog/item/c53d392ec9038f564ec2264a.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=??????">
<script language="javascript">
<!--
function imgSel()
{
var img = new Image();
img.src = document.imageForm.file.value;
document.imageForm.width.value = img.width;
document.imageForm.height.value = img.height;
document.imageForm.size.value = img.fileSize;
document.images['image'].src = img.src;
}
-->
</script>
</head>
<body>
<form name="imageForm">
宽: <input name="width" type="text" size="6"> 高: <input name="height" type="text" size="6"> 大小: <input name="size" type="text" size="6"><br>
<input name="file" type="file" onChange="imgSel()"><br>
<img src="" name="image">
</form>
</body>
</html>
转自：http://hi.baidu.com/top147/blog/item/f7c3023f641ec0ed54e723b1.html
<HTML><HEAD>
<SCRIPT>
// JS 判断文件大小
function getFileSize (fileName) {
if (document.all) {
window.oldOnError = window.onerror;
window.onerror = function (err) {
if (err.indexOf('utomation') != -1) {
alert('没有访问文件的权限');
return true;
}
else
return false;
};
var fso = new ActiveXObject('Scripting.FileSystemObject');
var file = fso.GetFile(fileName);
window.onerror = window.oldOnError;
return file.Size; }}
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME="formName"><INPUT TYPE="file" NAME="fileName"><BR>
<INPUT TYPE="button" VALUE="查看文件字节大小" ONCLICK="alert(getFileSize(this.form.fileName.value))"><BR>
</FORM></BODY>
</HTML>