JS本地預覽圖片
阿新 • • 發佈：2019-02-04
原文：http://www.jb51.net/article/56634.htm
<!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"> //下面用於圖片上傳預覽功能 function setImagePreview(avalue) { var docObj = document.getElementById("doc"); var imgObjPreview = document.getElementById("preview"); if (docObj.files && docObj.files[0]) { //火狐下，直接設img屬性 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()方式獲取，需要一下方式 imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]); } else { //IE下，使用濾鏡 docObj.select(); var imgSrc = document.selection.createRange().text; var localImagId = document.getElementById("localImag"); //必須設定初始大小 localImagId.style.width = "150px"; localImagId.style.height = "180px"; //圖片異常的捕捉，防止使用者修改後綴來偽造圖片 try { localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; localImagId.filters .item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc; } catch (e) { alert("您上傳的圖片格式不正確，請重新選擇!"); return false; } imgObjPreview.style.display = 'none'; document.selection.empty(); } return true; } </script> </head> <body> <div id="localImag"> <img id="preview" src="http://blog.chuangling.net/Public/images/top.jpg" width="150" height="180" style="display: block; width: 150px; height: 180px;" /> </div> <input type="file" name="file" id="doc" style="width: 150px;" onchange="javascript:setImagePreview();"> </td> </body> </html>