<html>
<head>
<script type="text/javascript">
function fileChange(target){
//检测上传文件的类型
var imgName = document.all.up_file.value;
var ext,idx;
if (imgName == ''){
document.all.submit_upload.disabled=true;
alert("请选择需要上传的文件!");
return;
} else {
idx = imgName.lastIndexOf(".");
if (idx != -1){
ext = imgName.substr(idx+1).toUpperCase();
ext = ext.toLowerCase( );
// alert("ext="+ext);
if (ext != 'jpg' && ext != 'png' && ext != 'jpeg' && ext != 'gif'){
document.all.submit_upload.disabled=true;
alert("只能上传.jpg .png .jpeg .gif类型的文件!");
return;
}
} else {
document.all.submit_upload.disabled=true;
alert("只能上传.jpg .png .jpeg .gif类型的文件!");
return;
}
}
//检测上传文件的大小
var isIE = /msie/i.test(navigator.userAgent) && !window.opera;
var fileSize = 0;
if (isIE && !target.files){
var filePath = target.value;
var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
var file = fileSystem.GetFile (filePath);
fileSize = file.Size;
} else {
fileSize = target.files[0].size;
}
var size = fileSize / 1024*1024;
if(size>(1024*200)){
document.all.submit_upload.disabled=true;
alert("文件大小不能超过200KB");
}else{
document.all.submit_upload.disabled=false;
}
}
</script>
</head>
<body>
<input type="file" id="up_file" name="up_file" onchange="fileChange(this);" />
<input id="submit_upload" type="submit" class="load-btn" value="上传" disabled />
</body>
</html>
