jQuery统计上传文件大小的方法

<input type="file" name="f" id="f" value="上传文件"/>
<input type="button" value="获取上传图片的大小" id="g"/>
@section scripts
{
    <script type="text/javascript">
        $(function() {
            $('#g').on("click", function() {
                getFileSize("f");
            });
        });
        function getFileSize(eleId) {
            try {
                var size = 0;
              
                if ($.browser.msie) {//ie旧版浏览器
                    var fileMgr = new ActiveXObject("Scripting.FileSystemObject");
                    var filePath = $('#' + eleId)[0].value;
                    var fileObj = fileMgr.getFile(filePath);
                    size = fileObj.size; //byte
                    size = size / 1024;//kb
                    //size = size / 1024;//mb
                } else {//其它浏览器
                    size = $('#' + eleId)[0].files[0].size;//byte
                    size = size / 1024;//kb
                    //size = size / 1024;//mb
                }
                alert('上传文件大小为' + size + 'kb');
            } catch (e) {
                alert("错误" + e);
            }
        }
    </script>
}