<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="jquery1.8/jquery-1.8.0.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function () { $("#myFile").change(function () { var filepath = $("input[name='myFile']").val(); var extStart = filepath.lastIndexOf("."); var ext = filepath.substring(extStart, filepath.length).toUpperCase(); if (ext != ".BMP" && ext != ".PNG" && ext != ".GIF" && ext != ".JPG" && ext != ".JPEG") { alert("图片限于bmp,png,gif,jpeg,jpg格式"); $("#fileType").text("") $("#fileSize").text(""); return false; } else { $("#fileType").text(ext) } var file_size = 0; if ($.browser.msie) { var img = new Image(); img.src = filepath; while (true) { if (img.fileSize > 0) { if (img.fileSize > 3 * 1024 * 1024) { alert("图片不大于100MB。"); } else { var num03 = img.fileSize / 1024; num04 = num03.toFixed(2) $("#fileSize").text(num04 + "KB"); } break; } } } else { file_size = this.files[0].size; var size = file_size / 1024; if (size > 10240) { alert("上传的图片大小不能超过10M！"); } else { var num01 = file_size / 1024; num02 = num01.toFixed(2); $("#fileSize").text(num02 + " KB"); } } return true; }); }); </script> <title>无标题文档</title> </head> <body> <table width="500" cellspacing="0" cellpadding="0"> <tr> <td width="72" id="fileType"> </td> <td width="242"> <input type="file" name="myFile" id="myFile" /> </td> <td width="184" id="fileSize" class="fileSize"> </td> </tr> </table> </body> </html>