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<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="Generator" content="EditPlus?"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <title>Document</title> </head> <body> <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 = ‘150px‘; 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 = "150px"; localImagId.style.height = "120px"; /*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> <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> </body> </html>
javscript上传图片前预览的方法setPreViewImage()
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原文地址：http://www.cnblogs.com/laijie/p/4745808.html
