javascript获取wx.config内部字段解决微信分享

背景
在微信分享开发的时候我们通常的流程是

<?php require_once "jssdk.php"; $jssdk = new JSSDK("yourAppID", "yourAppSecret"); $signPackage = $jssdk->GetSignPackage(); ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>微信分享</title> </head> <body> </body> <script src="https://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> <script> wx.config({ appId: '<?php echo $signPackage["appId"];?>', timestamp: <?php echo $signPackage["timestamp"];?>, nonceStr: '<?php echo $signPackage["nonceStr"];?>', signature: '<?php echo $signPackage["signature"];?>', jsApiList: ['onMenuShareTimeline' 'onMenuShareAppMessage' ] }); wx.ready(function() { wx.onMenuShareTimeline({ title: '', // 分享标题 link: '', // 分享链接 imgUrl: '', // 分享图标 success: function() { // 用户确认分享后执行的回调函数 }, cancel: function() { // 用户取消分享后执行的回调函数 } }); wx.onMenuShareAppMessage({ title: '', // 分享标题 desc: '', // 分享描述 link: '', // 分享链接 imgUrl: '', // 分享图标 type: '', // 分享类型,music、video或link,不填默认为link dataUrl: '', // 如果type是music或video,则要提供数据链接,默认为空 success: function() { // 用户确认分享后执行的回调函数 }, cancel: function() { // 用户取消分享后执行的回调函数 } }); }); </script> </html>

上面是一个php文件,这样的代码的一个很大缺点是前后端未分离耦合度太高,再一就是混合写不是很美观,所以我们要让PHP和HTML分离,要实现分享功能,首先就是要调用用微信的jssdk Api获取到配置参数, 这个必须是要通过php后台语言来获取的,然后将这些参数配置于wx.config中,在wx.config之前要先引入 然后就可以写分享的函数了,他们的依赖关系是wx.config 需要js库和config内部的参数,分享依赖wx.config
所以最重要的就把php的配置参数分离出来单独获取即可

解决方案
将获取配置参数的PHP写作为接口,在js里使用ajax调用,获取参数并转换为对象,再通过回调函数将ajax获取的参数塞到wx.config中

代码结构及功能

javascript获取wx.config内部字段解决微信分享


index.html 页面入口

weixin.php 服务器端获取配置参数

configdata.php将配置转为借口输出

getconfig.js 用ajax获取configdata.php的数据

share.js 分享回调函

webpack.config.js webpack配置文件

index.js 打包后最终html调用js文件

index.html html静态文件

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>静态页面微信分享测试</title> </head> <body> <script src="https://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> <script src="https://www.jb51.net/statics/js/index.js"></script> </body> </html>

configdata.php 后台获取配置的参数 注意url要写上自己被分享的页面url不然会报invalid signature错误

<?php class JSSDK { private $appId; private $appSecret; public function __construct($appId, $appSecret) { $this->appId = $appId; $this->appSecret = $appSecret; } public function getSignPackage() { $jsapiTicket = $this->getJsApiTicket(); $url = "http://$_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=$nonceStr&timestamp=$timestamp&url=$url"; $signature = sha1($string); $signPackage = array( "appId" => $this->appId, "nonceStr" => $nonceStr, "timestamp" => $timestamp, "url" => $url, "signature" => $signature, "rawString" => $string ); 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 $data = json_decode(file_get_contents("jsapi_ticket.json")); if ($data->expire_time < time()) { $accessToken = $this->getAccessToken(); $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken"; $res = json_decode($this->httpGet($url)); $ticket = $res->ticket; if ($ticket) { $data->expire_time = time() + 7000; $data->jsapi_ticket = $ticket; $fp = fopen("jsapi_ticket.json", "w"); fwrite($fp, json_encode($data)); fclose($fp); } } else { $ticket = $data->jsapi_ticket; } return $ticket; } private 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 $data = json_decode(file_get_contents("access_token.json")); if ($data->expire_time < time()) { $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret"; $res = json_decode($this->httpGet($url)); $access_token = $res->access_token; if ($access_token) { $data->expire_time = time() + 7000; $data->access_token = $access_token; $fp = fopen("access_token.json", "w"); fwrite($fp, json_encode($data)); fclose($fp); } } else { $access_token = $data->access_token; } return $access_token; } private function httpGet($url) { $curl = curl_init(); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); curl_setopt($curl, CURLOPT_TIMEOUT, 500); curl_setopt($curl, CURLOPT_URL, $url); $res = curl_exec($curl); curl_close($curl); return $res; } }

weixin.php 将配置参数格式化输出

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