微信小程序webview实现长按点击识别二维码功能示例
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2024-02-05 21:36:34
本文实例讲述了微信小程序webview实现长按点击识别二维码功能。分享给大家供大家参考,具体如下:
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...
本文实例讲述了微信小程序webview实现长按点击识别二维码功能。分享给大家供大家参考,具体如下:
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:
<script src="http://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script> <script type="text/javascript"> $(function(){ var returndata = false; $.ajax({ type : "get", url : 'http://app.ka.com/m/config.php', data : [], async : false, success: function(data,textstatus,jqxhr){ returndata = data; //console.log(returndata); } });//end ajax var returndata = eval('(' + returndata + ')'); console.log(returndata); var appid = returndata.appid; var timestamp = returndata.timestamp; var noncestr = returndata.noncestr; var signature = returndata.signature; wx.config({ debug: true, //调试阶段建议开启 appid: appid, timestamp: timestamp, noncestr: noncestr, signature: signature, jsapilist: [ /* * 所有要调用的 api 都要加到这个列表中 * 这里以图像接口为例 */ "chooseimage", "previewimage", "uploadimage", "downloadimage", "scanqrcode" ] }); wx.ready(function() { //alert(3); wx.checkjsapi({ jsapilist : ['scanqrcode','previewimage'], success : function(res) { } }); $("img").click(function(){ var url = "http://app.ka.com/"+$(this).attr("src"); wx.previewimage({ current: url, // 当前显示图片的http链接 urls: [url] // 需要预览的图片http链接列表 }); }); }); wx.error(function(res){ // config信息验证失败会执行error函数,如签名过期导致验证失败,具体错误信息可以打开config的debug模式查看,也可以在返回的res参数中查看,对于spa可以在这里更新签名。 console.log(res); }); }); </script>
2、服务端代码(获取config配置信息):
<?php date_default_timezone_set("asia/shanghai"); $jssdk = new jssdk(); $signpackage = $jssdk->getsignpackage(); echo json_encode($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($fp, "<?php exit();?>" . json_encode($data)); fclose($fp); } }
这里再为大家推荐一款功能相似的在线工具供大家参考:
在线二维码解码识别工具:
希望本文所述对大家微信小程序开发有所帮助。