//最大文件限制转换成mb
                        var maxFilesize = (function (maxsize) {
                            var matches = maxsize.toString().match(/^([0-9\.]+)(\w+)$/);
                            var size = matches ? parseFloat(matches[1]) : parseFloat(maxsize),
                                unit = matches ? matches[2].toLowerCase() : 'b';
                            var unitDict = {'b': 0, 'k': 1, 'kb': 1, 'm': 2, 'mb': 2, 'gb': 3, 'g': 3, 'tb': 4, 't': 4};
                            var y = typeof unitDict[unit] !== 'undefined' ? unitDict[unit] : 0;
                            var bytes = size * Math.pow(1024, y);
                            return bytes / Math.pow(1024, 2);
                        }(maxsize));

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