微信小程序webview识别二维码长按点击识别二维码

场景：微信小程序，使用webview控件。需求：点击图片后长按图片出现“识别二维码”

1、JS代码：

2.服务端代码（获取config配置信息）：

getSignPackage();
echo json_encode($signPackage);exit;

class Jssdk
{
	private $_CI;

    private $appId;
    private $appSecret;

    public function __construct($appId='wx666666', $appSecret='ee32') {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }

    public function getSignPackage() {
        $jsapiTicket = $this->getJsApiTicket();

        // 注意 URL 一定要动态获取，不能 hardcode.
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

        $timestamp = time();
        $nonceStr = $this->createNonceStr();

        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr×tamp=$timestamp&url=$url";

        $signature = sha1($string);

        $signPackage = array(
            "appId"     => $this->appId,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "url"       => $url,
            "signature" => $signature,
            "rawString" => $string,
            'jsapiTicket' =>$jsapiTicket,
        );
        return $signPackage;
    }

    private function createNonceStr($length = 16) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    private function getJsApiTicket() {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = $this->get_php_file("jsapi_ticket");
        //echo $data['expire_time'].'------'.time();
        //print_r($data);exit;

        if (!isset($data['jsapi_ticket']) ||  (isset($data['expire_time'])  && $data['expire_time'] < time())) {
            //echo 1111;
            $accessToken = $this->getAccessToken();
            // 如果是企业号用以下 URL 获取 ticket
            // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            //echo $url;
            $res = json_decode($this->httpGet($url), true);

            $ticket = isset($res['ticket']) ? $res['ticket'] : false;
            if ($ticket) {
                $data['expire_time'] = time() + 7160;
                $data['token_value'] = $ticket;
                $this->set_php_file("jsapi_ticket", $data);
            }
        } else {
            //echo 22222;
            $ticket = $data['jsapi_ticket'];
        }

        return $ticket;
    }

    public function getAccessToken() {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = $this->get_php_file("access_token");
        if (!isset($data['access_token']) ||  (isset($data['expire_time']) && $data['expire_time'] < time())) {
            // 如果是企业号用以下URL获取access_token
            // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this->httpGet($url));
            //var_dump($res);exit;
            $access_token = $res->access_token;
            if ($access_token) {
                $data['expire_time'] = time() + 7160;
                $data['token_value'] = $access_token;
                $this->set_php_file("access_token", $data);
            }
        } else {
            $access_token = $data['access_token'];
        }
        return $access_token;
    }

    private function httpGet($url) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
        // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_URL, $url);

        $res = curl_exec($curl);
        curl_close($curl);

        return $res;
    }

    private function get_php_file($token_name) {
		if(file_exists($token_name)) return false;
        return json_decode(file_get_contents($token_name), true);
    }
    private function set_php_file($token_name, $data) {
        $fp = fopen($token_name, "w");
        fwrite($fp, "" . json_encode($data));
        fclose($fp);
    }

}
/* End of file Jssdk.php */