微信支付

微信支付小程序支付

前言：此篇博客是实现微信小程序支付，语言是ThinkPHP（php）+微信小程序,需要商户号，appid,服务器。

参考:
小程序支付API文档
微信小程序开发文档

PHP代码如下：
Index.php

param('openid')){ return json_encode(['state'=>-1,'msg'=>'err lack field! openid']) ; }
        if( !$request->param('order_price') ){ return json_encode(['state'=>-1,'msg'=>'err lack field!']) ; }
        if( !is_float((float)$request->param('order_price') ) ){ return json_encode( ['state' => -1 , 'msg' => 'err type of field '] );}
      
        $orderInfo['order_price'] = (float)$request->param('order_price');
        $orderInfo['openid']=$request->param('openid');
        //生成订单号
        $orderInfo['order_no'] = date( 'Ymd' , time() ). time() . rand(1000000,9999999);
        //订单名称
        $orderInfo['order_title'] = '微信支付测试';
        //开启事务
        Db::startTrans();
        try{
            //需要修改
            $url = 'http://***/public/pay/Pay/index';
            $result = $this->post_curl( $url , $orderInfo );

            //此处等于200
            if( !$result['state'] == 200 ){ Db::rollback();  return json_encode( [ 'state' => 0 , 'msg' => '订单生成失败！' , 'result' => $result ] ); }
            //查看用户是否已经下单，删除未支付订单  Record_order 临时订单表
            // $order = Db::table('record_order')->where([ 'openid'=>$orderInfo['openid'] , 'state' => 0 ])->find();
            // if( $order ){ Db::table('record_order')->where( 'id' , $order['id'] )->delete() ; }

            //保存订单
            $is_in = Db::table('record_order')->insert([
                'id' => $orderInfo['order_no'] ,
                'openid' => $orderInfo['openid'] ,
                'price' => $orderInfo['order_price'] ,
                'nonce_str' => $result['nonceStr'] ,
                'state'=>0,
                'timestamp' => date( 'Y-m-d h:i:s' ) ]);

            if( !$is_in ){  Db::rollback(); return json_encode( [ 'state' => -1 , 'msg' => '订单保存失败！请重试！']) ; }
           //下单记录

//            Db::table('List_ticket')->update( [ 'id' => $tickes[$i]['id'] , 'openid' => $orderInfo['openid'] , 'time_add' => time() ] );
            Db::commit();

        }catch (Exception $e){
            Db::rollback();
            return json_encode(['state'=>0 , 'msg' => '系统错误']) ;
        }
        return json_encode( ['state' => 1 , 'msg' => '下单成功！' , 'result' => $result ]);

    }

    public function checkOrder(){
        $request=Request::instance();

        if( !$request->param('out_trade_no') ){ return json_encode( ['state' => -1 , 'msg' => 'lack field of out_trade_no '] ) ; }
        $orderInfo['out_trade_no'] = $request->param('out_trade_no');
        if( !$request->param('openid') ){ return json_encode( ['state' => -1 , 'msg' => 'lack field of openid'] ) ; }
        $orderInfo['openid'] = $request->param('openid');
        if( !$request->param('nonceStr') ){ return json_encode( ['state' => -1 , 'msg' => 'lack field of nonceStr '] ) ; }
        $orderInfo['nonceStr'] = $request->param('nonceStr');
        
        //检查有没有订单返回
        $orderInfo_result = Db::table('record_odcb')->where('out_trade_no',$orderInfo['out_trade_no'])->find();

        if(!$orderInfo_result){
            //当微信未能callback返回时，主动查询票据
            $url = 'http://***/public/pay/Pay/checkOrder';
            $result = $this->post_curl( $url , $orderInfo );
            if( !$result['state'] == 1 ){ return json_encode( ['state'=>0 , 'msg'=>'支付失败！' ] ) ; }
            else {
                $res=Db::table('record_order')->where('nonceStr',$orderInfo['nonceStr'])->update('state',2);
                 if($res){
                    return json_encode( ['state' => 1 , 'msg' => '支付成功,订单状态修改成功'] ) ;
                 }else{
                    return json_encode( ['state' => 1 , 'msg' => '支付成功,订单状态修改失败'] ) ;
                 }
               
            }
            
        }
        return json_encode( ['state' => 1 , 'msg' => '支付成功,订单状态修改成功'] ) ;
    }


    /**
     * 获取用户信息
     */
    /**
     * @return string
     * 名称：获取用户信息
     * url http://localhost/jingwei/public/test/Wx/getInfo
     * 需要 $appid  $secret
     * 传入  encryptedData iv js_code
     * 返回 -1 or  1
     *
     *
     */

    public function getInfo(){

        $request=Request::instance();
        if (!$request->param('encryptedData')) {return json_encode(['state' => -1, 'msg' => 'err lack field!']);}
        $data['encryptedData'] = $request->param('encryptedData');
        if (!$request->param('iv')) {return json_encode(['state' => -1, 'msg' => 'err lack field!']);}
        $data['iv'] = $request->param('iv');
        if (!$request->param('js_code')) {return json_encode(['state' => -1, 'msg' => 'err lack field!']);}
        $data['js_code'] = $request->param('js_code');
        //获取Session  获取openid
        $session_key = json_decode($this->getSession($this->appid, $this->secret, $data['js_code']), true);
        if (!isset($session_key['openid'])) {
            return json_encode(['state' => -1, 'msg' => '请重新登录！']);
        }
        $openid = $session_key['openid'];
        $errCode = $this->decryptData($session_key['session_key'], $data['encryptedData'], $data['iv'], $result);
        if ($errCode !=0) {return json_encode(['state' => $errCode, 'msg' => 'err at getPhoneNumber ']);}
        $phoneData = json_decode($result, true);
//        return json_encode(['state' => 1, 'msg' => '获取手机号成功！','phoneNumber'=>$phoneData['phoneNumber'], 'openid' => $openid, 'info' =>$phoneData]);
        //存储
        $res=Db::table('user')->where('openid',$openid)->find();
        if($res){
            $update=['phone'=>$phoneData['phoneNumber']];
            Db::table('user')->where('openid',$openid)->update($update);
            return json_encode(['state' => 1, 'msg' => '更新成功！', 'openid' => $openid, 'info' =>$phoneData]);
        }else{
            $insert=[
                'openid'=> $openid,
                'phone'=> $phoneData['phoneNumber']
            ];
            Db::table('user')->insert($insert);
            return json_encode(['state' => 1, 'msg' => '插入成功！', 'openid' => $openid, 'info' =>$phoneData]);
        }
    }

    //登录凭证校验
    private function getSession( $appid , $secret , $js_code ){
        //userInfo用户登录
        if( !$js_code ){ return json_encode([ 'state' => -2 , 'msg' => 'err lack js_code']) ; }
        if( !$appid ){ return json_encode([ 'state' => -2 , 'msg' => 'err lack appid']) ; }
        if( !$secret ){ return json_encode([ 'state' => -2 , 'msg' => 'err lack secrrt']) ; }

        $url = "https://api.weixin.qq.com/sns/jscode2session?appid=$this->appid&secret=$this->secret&js_code=$js_code&grant_type=authorization_code";

        $data = $this->get_curl( $url );

        return json_encode($data) ;
    }

    //手机号码解密模块
    protected function decryptData( $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 != $this->appid )
        {
            return -41003;
        }
        $data = $result;
        return 0;
    }

    //get请求
    private function get_curl( $url ){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        curl_close($ch);
        $output = json_decode($output,true);
        return $output;
    }





    //post请求
    private function post_curl( $url , $data ){
        $data  = json_encode($data);
        $headerArray =array("Content-type:application/json;charset='utf-8'","Accept:application/json");
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,FALSE);
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        curl_setopt($curl,CURLOPT_HTTPHEADER,$headerArray);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);

        if( is_object($output) ){ return json_decode($output,true); }

        return json_decode($output,true);
    }

}

Pay.php文件

namespace app\pay\controller;


use think\Controller;
use think\Db;
use think\Request;


class Pay extends Controller
{ 

    private $mch_id = '****' ; //商家号
    private $appid = '****';

    public function index(){
        $request = Request::instance();
        //用户openid
        if( !$request->param('openid') ) {
            return json_encode( [ 'state' => -1 , 'msg' => 'no field : orderInfo!' ] );
        }
        $orderInfo['openid'] = $request->param('openid');
        //订单名
        if( !$request->param('order_title') ) {
            return json_encode( [ 'state' => -1 , 'msg' => 'no field : order_title!' ] );
        }  $orderInfo['body'] = $request->param('order_title');
        //订单号
        if( !$request->param('order_no') ) {
            return json_encode( [ 'state' => -1 , 'msg' => 'no field : order_no!' ] );
        }  $orderInfo['out_trade_no'] = $request->param('order_no');
        //订单价（元）
        if( !$request->param('order_price') ) {    return json_encode( [ 'state' => -1 , 'msg' => 'no field : order_price!' ] ); }
        if( !is_float((float)$request->param('order_price') ) ){ return json_encode( ['state' => -1 , 'msg' => 'err type of field '] );}
        $orderInfo['order_price'] = (float)$request->param('order_price');
      
        $this->pay( $orderInfo );
    }

    //支付回调
    public function callBack(){

        $testxml  = file_get_contents("php://input");
        $jsonxml = json_encode(simplexml_load_string($testxml, 'SimpleXMLElement', LIBXML_NOCDATA));
        $result = json_decode($jsonxml, true);
        if($result && $result['return_code'] == 'SUCCESS' && $result['result_code'] == 'SUCCESS'){

            $orderInfo['out_trade_no'] = $result['out_trade_no'];
            $orderInfo['transaction_id'] = $result['transaction_id'];
            $orderInfo['openid'] = $result['openid'];
            $orderInfo['total_fee'] = $result['total_fee']*0.01;
            $orderInfo['nonce_str'] = $result['nonce_str'];
            $orderInfo['time_end'] = $result['time_end'];

            //数据插入错误，信息临时储存
            if( ! Db::table('record_odcb')->insert($orderInfo) ){
                $str = '' ;
                foreach ( $result as $key => $val ){ $str .= $key . '=' . $val . '&' ; }
                Db::table('record_oderr')->insert($orderInfo);
                return ;
            }
            //开启事务
            Db::startTrans();
            try{
                //修改订单为已支付状态
                Db::table('record_order')->where( 'id' , $orderInfo['out_trade_no'] )->update(['state'=>2]);
                //执行事务
                Db::commit();
            } catch (\Exception $e) {

                Db::rollback();
                return ;
            }
            return ''.$result['return_code'].'OK' ;

        }

        return ;
    }
    /***
     * @return string
     * 名称：查询订单
     *
     */
    public function checkOrder(){

  
        //请求限制
        $request = Request::instance();
        if( !$request->param('out_trade_no') ){ return json_encode( ['state' => -1 , 'msg' => 'err type of field '] ) ; }
        $out_trade_no = $request->param('out_trade_no');
        if( !$request->param('openid') ){ return json_encode( ['state' => -1 , 'msg' => 'err type of field '] ) ; }
        $openid = $request->param('openid');
        if( !$request->param('nonceStr') ){ return json_encode( ['state' => -1 , 'msg' => 'err type of field '] ) ; }
        $nonceStr = $request->param('nonceStr');
        //签名字段
        $post['appid']       =  $this->appid ;
        $post['mch_id']       =  $this->mch_id ;
        $post['nonce_str']    =  $nonceStr ;
        $post['out_trade_no']  =  $out_trade_no ;
        //字段排序
        $post = array_filter($post);
        //签名
        $sign = $this->sign($post);
        //拼接xml字符
        $xml = '
                '.$this->appid.'
                '.$this->mch_id.'
                '.$post['nonce_str'].'
                '.$out_trade_no.'
               '.$sign.'
            ' ;
        //请求接口数据
        $result = $this->http_request( 'https://api.mch.weixin.qq.com/pay/orderquery' , $xml );

        $data_arr = $this->xml($result);

        if( $data_arr['RESULT_CODE'] != 'SUCCESS' ){ return json_encode([ 'state' => 0 , 'msg' => 'err no order ']) ; }
        //此处是针对微信支付成功，但没有进行回调callback，而进行的查询
        return json_encode([ 'state'=>1 , 'msg' => 'success']) ;
    }
    /***
     * @return string
     * 名称：微信支付调用关单接口
     * 描述：应用场景在调取微信支付超时（5分钟）进行调用此接口，进行关闭账单
     */
    public function closeorder(){
        //请求限制
//        $request = Request::instance();
//        if( !$request->param('out_trade_no') ){ return json_encode( ['state' => -1 , 'msg' => 'lack of field '] ) ; }
//        $out_trade_no = $request->param('out_trade_no');
//        if( !$request->param('nonceStr') ){ return json_encode( ['state' => -1 , 'msg' => 'lack of field '] ) ; }
//        $nonceStr = $request->param('nonceStr');
        $out_trade_no = '2020020715810491235452259';
        $nonceStr = 'I2E7BNYML3SGD27QGNNW08LSKY9ODUKY';
        //签名字段
        $post['appid']       =  $this->appid ;
        $post['mch_id']       =  $this->mch_id ;
        $post['nonce_str']    =  $nonceStr ;
        $post['out_trade_no']  =  $out_trade_no ;
        //字段排序
        $post = array_filter($post);
        //签名
        $sign = $this->sign($post);
        //拼接xml字符
        $xml = '
                '.$this->appid.'
                '.$this->mch_id.'
                '.$post['nonce_str'].'
                '.$post['out_trade_no'].'
               '.$sign.'
            ' ;
        //请求接口数据
        $result = $this->http_request( 'https://api.mch.weixin.qq.com/pay/closeorder' , $xml );

        $data_arr = $this->xml($result);

//        if(  ){ return json_encode([ 'state' => 0 , 'msg' => 'err close order ']) ; }
        if( $data_arr['RETURN_CODE'] == 'SUCCESS'&&$data_arr['RESULT_CODE'] == 'SUCCESS' ){
            //关单操作失败
            return json_encode([ 'state'=>1 , 'msg' => 'success','data'=>$data_arr]) ;
        }
        //关单操作失败
        return json_encode([ 'state' => 0 , 'msg' => 'err close order','data'=>$data_arr]) ;
    }



    //微信支付
    private function pay( $orderInfo ){
   
        //这里是按照顺序的 因为下面的签名是按照顺序 排序错误 肯定出错
        $post['appid'] =         $this->appid;        //appid.如果是公众号 就是公众号的appid
        $post['body'] =             $orderInfo['body'];             //商品描述
        $post['mch_id'] =        $this->mch_id;             //商户号
        $post['nonce_str'] =      $this->nonce_str();             //随机字符串
        $post['notify_url'] =     'http://******/public/pay/Pay/callBack'; //回调的url【自己填写】
        $post['openid'] =        $orderInfo['openid'] ;       //用户openid
        $post['out_trade_no'] =       $orderInfo['out_trade_no'] ;   //商户订单号;
        $post['spbill_create_ip'] =    '47.97.***';             //服务器的ip;
        $post['total_fee'] =      $orderInfo['order_price']*100; // 微信支付单位是分，所以这里需要*100
        $post['trade_type'] =     'JSAPI';                  //交易类型 默认
        $post = array_filter($post);
        $sign = $this->sign($post);//签名

        $post_xml =
            '
              '.$post['appid'].'
              '.$post['body'].'
              '.$post['mch_id'].'
              '.$post['nonce_str'].'
              '.$post['notify_url'].'
              '.$post['openid'].'
              '.$post['out_trade_no'].'
              '.$post['spbill_create_ip'].'
              '.$post['total_fee'].'
              '.$post['trade_type'].'
              '.$sign.'
             ';
        //print_r($post_xml);die;
        //统一接口prepay_id
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $xml = $this->http_request($url,$post_xml);
        $array = $this->xml($xml);//全要大写
        // print_r($array);
        if($array['RETURN_CODE'] == 'SUCCESS' && $array['RESULT_CODE'] == 'SUCCESS'){
            $time = time();
            $tmp=[];//临时数组用于签名
            $tmp['appId'] = $post['appid'];
            $tmp['nonceStr'] = $post['nonce_str'];
            $tmp['package'] = 'prepay_id='.$array['PREPAY_ID'];
            $tmp['signType'] = 'MD5';
            $tmp['timeStamp'] = "$time";


            $data['state'] = 200;
            $data['timeStamp'] = "$time";//时间戳
            $data['nonceStr'] = $post['nonce_str'];//随机字符串
            $data['signType'] = 'MD5';//签名算法，暂支持 MD5
            $data['package'] = 'prepay_id='.$array['PREPAY_ID'];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
            $data['paySign'] = $this->sign($tmp);//签名,具体签名方案参见微信公众号支付帮助文档;
            $data['out_trade_no'] = $post['out_trade_no'];

        }else{
            $data['state'] = 0;
            $data['text'] = "error";
            $data['RETURN_CODE'] = $array['RETURN_CODE'];
            $data['RETURN_MSG'] = $array['RETURN_MSG'];
        }
        echo json_encode($data);
    }

    
    /** 以下是方法  **/

    //随机32位字符串
    private function nonce_str(){
        $result = '';
        $str = 'QWERTYUIOPASDFGHJKLZXCVBNM1234567890';
        for ($i=0;$i<32;$i++){
            $result .= $str[rand(0,35)];
        }
        return $result;
    }
    //生成订单号
    private function order_number(){  return date('Ymd',time()).time().rand(10,99); }

    //签名 $data要先排好顺序
    private function sign($data){
        $stringA = '';
        foreach ($data as $key=>$value){
            if(!$value) continue;
            if($stringA){ $stringA .= "&$key=$value" ; }
            else{ $stringA = $key.'='.$value ; }
        }
        $wx_key = 'abcdefghijklmnopqrstuvwxyzABCD12';//申请支付后有给予一个商户账号和密码，登陆后自己设置的key

        $stringSignTemp = $stringA.'&key='.$wx_key;
        return strtoupper(md5($stringSignTemp));
    }

    //curl请求
    public function http_request($url,$data = null,$headers=array())
    {
        $curl = curl_init();
        if( count($headers) >= 1 ){
            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        }
        curl_setopt($curl, CURLOPT_URL, $url);

        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);

        if (!empty($data)){
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }
    //获取xml
    private function xml($xml){
        $p = xml_parser_create();
        xml_parse_into_struct($p, $xml, $vals, $index);
        xml_parser_free($p);
        $data = [];
        foreach ( $vals as $key=>$value) {
            if( $vals[$key]['tag'] == 'xml' ||  $vals[$key]['tag'] == 'XML') continue;
            $tag = $vals[ $key ][ 'tag' ];
            $value = $vals[ $key ][ 'value' ];
            $data[$tag] = $value;
        }
        return $data;
    }


    /**
     * @param string $url
     * @param string $postData
     * @param array $options
     * @return bool|mixed
     * 微信退款使用curl方法
     */
    protected function curlPost($url = '', $postData = '', $options = array()) {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        //第一种方法，cert 与 key 分别属于两个.pem文件
        //默认格式为PEM，可以注释
        curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
        curl_setopt($ch, CURLOPT_SSLCERT, ROOT_PATH.'vendor'.DS.'wxpay'.DS.'cert'.DS.'apiclient_cert.pem'); //证书绝对路径
        //默认格式为PEM，可以注释
        curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
        curl_setopt($ch, CURLOPT_SSLKEY, ROOT_PATH.'vendor'.DS.'wxpay'.DS.'cert'.DS.'apiclient_key.pem');//证书绝对路径
        //第二种方式，两个文件合成一个.pem文件
        //curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
        $data = curl_exec($ch);
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            echo "curl出错，错误码: ".$error."
";
            curl_close($ch);
            return false;
        }
    }



}

小程序代码

<button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber" >获取手机号码 </button>
<form bindsubmit="formSubmit" bindreset="formReset"> <view>    <view>金额</view>    <view><input name="moneyNum" placeholder="请输入金额" /></view>    <view><button form-type="submit">Submit提交</button></view>    <view><button form-type="reset">Reset重置</button></view></view></form>

 
getPhoneNumber: function (e) {

    wx.login({

     
success(res) {

        if
(!res.code) { wx.showToast({ title: '登录失败！', icon: 'none'
}); return; }

        var data
= {

         
encryptedData: e.detail.encryptedData,

          iv:
e.detail.iv,

         
js_code: res.code

        }

        var url
= 'http://*****/public/pay/Index/getInfo';

       
wx.request({

          url:
url,

          data:
data,

         
method:'POST',

         
header: {

           
"content-type": "application/x-www-form-urlencoded"

          },

         
success(res){

           
conso***le.log(res);

            //
var data = JSON.parse(res.data);

           
console.log(res.data.openid);

            app.globalData.openid = res.data.openid

           

          },

         
fail(res){

           
console.log(res);

          }

        })

 

      }

    })

  },

canIUse: wx.canIUse('button.open-type.getUserInfo'),

 

formSubmit: function (e) {

   
var that=this;

   
console.log(e.detail.value.moneyNum)

 

   
var url = 'http://**/public/pay/index/buyOrder';

   
var data={

     
openid: app.globalData.openid,

     
order_price: e.detail.value.moneyNum

   
};

   
console.log(data);

   
wx.request({

     
url: url,

     
data: data,

     
method: 'POST',

     
header: {

       
"content-type": "application/x-www-form-urlencoded"

     
},

     
success(res) {

       
console.log(res);

       
console.log(res.data);

       
if (res.data.state == 1) { that.pay(res.data); return; }

       
wx.showToast({ title: res.data.msg, icon: 'none' })

     
},

     
fail(res) {

       
console.log(res);

     
}

   
})

 

  },

下篇，讲述微信支付退款的内容。。