javaScript格式化文件大小

///格式化文件大小function formatFileSize(fileSize) {    if (fileSize < 1024) {        return fileSize + 'B';    } else if (fileSize < (1024*1024)) {        var temp = fileSize / 1024;        temp = temp.toFixed(2);        return temp + 'KB';    } else if (fileSize < (1024*1024*1024)) {        var temp = fileSize / (1024*1024);        temp = temp.toFixed(2);        return temp + 'MB';    } else {        var temp = fileSize / (1024*1024*1024);        temp = temp.toFixed(2);        return temp + 'GB';    }}