上传头像（转）

总算找到能用的
<!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>By：DragonDean</title>
<script type="text/javascript">
//下面用于图片上传预览功能
function setImagePreview(avalue) {
    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 = '150px';
        imgObjPreview.style.height = '180px';
        //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 = "150px";
        localImagId.style.height = "180px";
        //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>
</head>
 
<body>
    <table width="100%" border="0" cellspacing="0" cellpadding="0">
        <tbody>
            <tr>
                <td height="101" align="center">
                    <div id="localImag"><img id="preview" src="http://blog.chuangling.net/Public/images/top.jpg" width="150" height="180" style="display: block;  150px; height: 180px;"></div>
                </td>
            </tr>
            <tr>
                <td align="center" style="padding-top:10px;">
                    <input type="file" name="file" id="doc" style="150px;" onchange="javascript:setImagePreview();">
                </td>
            </tr>
        </tbody>
    </table>
</body>
</html>
来源：http://www.jb51.net/article/56634.htm