/**
     * 獲取jssdk簽名
     */
    public function signature(Request $request){
        //隨機字串
        $str = time() . rand(111111,999999). 'suibian';
        $nonce_str = substr( md5($str),5,8 );
        $timestamp = time(); //當前時間戳
        $url = $request['url'];  //需要前端傳過來

        $data = [
            'jsapi_ticket'
 
  => '文件有',
            'noncestr'      => $nonce_str,
            'timestamp'     => $timestamp,
            'url'           => $url
        ];

        $param = "";
        foreach($data as $k=>$v){
            $param .= $k.'='.$v.'&';
        }
        $p = rtrim($param,'&'
 
);
        //計算簽名
        $signature = sha1($p);
        $response['nonce_str'] = $nonce_str;
        $response['timestamp'] = $timestamp;
        $response['signature'] = $signature;
        $response['url'] = $url;
        echo json_encode($response);
    }