<script>
function setImagePreview() {
var docObj=document.getElementById("doc"); var imgObjPreview=document.getElementById("preview");
if(docObj.files&& docObj.files[0]){
//火狐下，直接设img属性
imgObjPreview.style.display = 'block'; imgObjPreview.style.width = '300px';
imgObjPreview.style.height = '120px'; //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("localImag"); //必须设置初始大小
localImagId.style.width = "250px";
localImagId.style.height = "200px";
//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;
}
</script>
<body>
<input type=file name="doc" id="doc" onchange="javascript:setImagePreview();"> <p><div id="localImag"><img id="preview" width=-1 height=-1 style="diplay:none" /></div></p>
。