Method normalizeURL

packages/fairygui/src/package/UIPackage.ts:244–248

* Normalize URL * 标准化 URL

(url: string)

     * 标准化 URL
     */
    public static normalizeURL(url: string): string {
        if (!url) return '';
        if (url.startsWith('ui://')) return url;
        return 'ui://' + url;
    }

    /**
     * Get item URL