JS上传图片预览兼容IE8 FireFox 长沙

<!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>无标题文档</title>
<style type="text/css">
        #preview_wrapper
        {
            display: inline-block;
             740px;
            height: 200px;
            background-color: #CCC;
        }
        #preview_fake
        {
            /* 该对象用户在IE下显示预览图片 */
            filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);
        }
        #preview_size_fake
        {
            /* 该对象只用来在IE下获得图片的原始尺寸，无其它用途 */
            filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);
            visibility: hidden;
        }
        #preview
        {
            /* 该对象用户在FF下显示预览图片 */
             740px;
            height: 200px;
        }

</style>
</head>
<script type="text/javascript" language="javascript">

function onUploadImgChange(sender, p, pf, psf,width,height) {
    if (!sender.value.match(/.jpg|.gif|.png|.bmp/i)) //忽略大小写
    {
        alert('图片格式无效！');
        return false;
    }
    var objPreview = document.getElementById(p); //图片1
    var objPreviewFake = document.getElementById(pf); //图片2
    var objPreviewSizeFake = document.getElementById(psf); //外套1
    if (sender.files && sender.files[0]) 
    {
        objPreview.style.display = 'block';
        objPreview.style.width = 'auto';
        objPreview.style.height = 'auto';
	   objPreview.src = window.URL.createObjectURL(sender.files[0]);


    }
    else if (objPreviewFake.filters) 
    {
        // IE7,IE8 在设置本地图片地址为 img.src 时出现莫名其妙的后果        
        //（相同环境有时能显示，有时不显示），因此只能用滤镜来解决        
        // IE7, IE8因安全性问题已无法直接通过 input[file].value 获取完整的文件路径        
        sender.select();
        var imgSrc = document.selection.createRange().text;
        objPreviewFake.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;
        objPreviewSizeFake.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;
        autoSizePreview(objPreviewFake, width, height);
        objPreview.style.display = 'none';
    }

}
function autoSizePreview(objPre, originalWidth, originalHeight) {
    objPre.style.width = originalWidth + 'px';
    objPre.style.height = originalHeight + 'px';
    objPre.style.marginTop = 0 + 'px';
    objPre.style.marginLeft = 0 + 'px';
}

</script>
<body>
                             <div id="preview_wrapper">
                                <div id="preview_fake">
                                    <img id="preview" src="" alt="" onload="autoSizePreview(this,740,200)" />
                                    <img id="preview_size_fake" src="" alt="" />
                                </div>
                            </div>
                            <br />
                            <input id="upload_img" name="upload_img" type="file" onchange="onUploadImgChange(this,'preview','preview_fake','preview_size_fake',740,200)" />
</body>
</html>
JS上传图片预览 兼容IE8 FireFox 长沙

JS上传图片预览兼容IE8 FireFox 长沙
