转自：http://canglang0.iteye.com/blog/1662268
<%@ page contentType="text/html;charset=UTF-8"%>
<html>
<head>
<title>图片上传预览</title>
<script>
function PreviewImage(imgFile)
{
var pattern = /(.*.jpg$)|(.*.png$)|(.*.jpeg$)|(.*.gif$)|(.*.bmp$)/;
if(!pattern.test(imgFile.value))
{
alert("系统仅支持jpg/jpeg/png/gif/bmp格式的照片！");
imgFile.focus();
}
else
{
var path;
if(document.all)//IE
{
imgFile.select();
path = document.selection.createRange().text;
document.getElementById("imgPreview").innerHTML="";
document.getElementById("imgPreview").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='scale',src="" + path + "")";//使用滤镜效果
}
else//FF
{
path = URL.createObjectURL(imgFile.files[0]);
document.getElementById("imgPreview").innerHTML = "<img src='"+path+"'/>";
}
}
}
</script>
</head>
<body>
<center>
<input type="file" onchange='PreviewImage(this)' />
<div id="imgPreview" style='500px; height:400px;'>
<img src=""/>
</div>
</center>
</body>
</html>