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