<!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>