interface Storage {

    readonly length: number;

    clear(): void;

    getItem(key: string): string | null;

    key(index: number): string | null;

    removeItem(key: string): void;

    setItem(key: string, value: string): void;

    [name: string]: any;

    /**
     * 用户 token
     */
    token: string | null

    emrCache: string | null
}

declare var localStorage: Storage;