<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片上传</title>
<script src="test.js" language="javascript"></script>
</head>
<body>
<input type="file" name="doc" id="doc" onchange="setImagePreview('doc','preview','localImag');"/>
<div id="localImag"><img id="preview" width=-1 height=-1 style="diplay:none" /></div>
</body>
</html>
function setImagePreview(fileObj, previewObj, localImg) {
var docObj=document.getElementById(fileObj);
var imgObjPreview=document.getElementById(previewObj);
if(docObj.files && docObj.files[0]){
//火狐下，直接设img属性
imgObjPreview.style.display = 'block';
imgObjPreview.style.width = '120px';
imgObjPreview.style.height = '80px';
//imgObjPreview.src = docObj.files[0].getAsDataURL();
//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式
imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
}else{
//IE下，使用滤镜
docObj.select();
var imgSrc = document.selection.createRange().text;
var localImagId = document.getElementById(localImg);
//必须设置初始大小
localImagId.style.width = "120px";
localImagId.style.height = "80px";
//图片异常的捕捉，防止用户修改后缀来伪造图片
try{
localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
}catch(e){
alert("您上传的图片格式不正确，请重新选择!");
return false;
}
imgObjPreview.style.display = 'none';
document.selection.empty();
}
return true;
}