export declare class CTYFormat {
    static fileSize(bytes: number, unitIndex?: number, unit?: number): string;
    /**
   *
   * @param num
   * @returns
   */
    static numberToChinese(num: number): string;
    /**
     *
     * @param minNum
     * @param maxNum
     * @returns
     */
    static randomNum(minNum: number, maxNum: number): number;
    /**
   *
   * @param num
   * @param n
   * @returns
   */
    static pad(num: number, n: number): string;
    /**
   *
   * @param val
   * @returns
   */
    static percent(val: number): string;
    /**
   *
   * @param val
   * @returns
   */
    static price(val: number): string;
    static convertNumber(val: number | string, digits?: number): string;
    /**
   *
   * @param n
   * @returns
   */
    static numberToLetter(n: number): string;
    static ParseJson(str: string): any;
    static ParseArr(str: string): any;
}