1.前端按钮

 <button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber"  class="btn">微信手机号</button>

2.js

  getPhoneNumber (e) {
    var _this = this;
    let openid = wx.getStorageSync('openid');
    let session_key = wx.getStorageSync('session_key');
        App._post('wechat/get_phone'
          , {
            openid: openid,
            session_key: session_key,
            encryptedData:e.detail.encryptedData,
            iv:e.detail.iv,
          }
          , function (result) {
              if(result.status==1){
　　　　　　　　　　　　//成功
              }
          }
        )
    
  },

 3.服务器后端

    //-获取微信手机号

    public function get_phone()
    {
        $status=0;$message='失败...';$http_status = 200;$data=[];
        $post=$this->request->param();
        $appid = self::$appid;  //小程序ID
        $sessionKey = $post['session_key'];
        $encryptedData = $post['encryptedData'];
        $iv = $post['iv'];

        $errCode = $this->decryptData($appid, $sessionKey,$encryptedData, $iv, $data );

        if ($errCode==0) {
            $status=1;
            $message='成功...';
            return self::response_data($status,$http_status,$message,$data);
        }else{
            return self::response_data($status,$http_status,$message,$errCode);
        }

        return $data;

    }

　　

/**
     * 检验数据的真实性，并且获取解密后的明文.
     * @param $encryptedData string 加密的用户数据
     * @param $iv string 与用户数据一同返回的初始向量
     * @param $data string 解密后的原文
     *
     * @return int 成功0，失败返回对应的错误码
     */
    public function decryptData($appid,$sessionKey, $encryptedData, $iv, &$data )
    {

        if (strlen($sessionKey) != 24) {
            return '-41001';
        }
        $aesKey=base64_decode($sessionKey);

        if (strlen($iv) != 24) {
            return '-41002';
        }
        $aesIV=base64_decode($iv);

        $aesCipher=base64_decode($encryptedData);

        $result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);

        $dataObj=json_decode( $result );
        if( $dataObj  == NULL )
        {
            return '-41003';
        }
        if( $dataObj->watermark->appid != $appid )
        {
            return '-41004';
        }
        $data = $dataObj;
    }