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;"> GetSignPackage(); ?> <Meta charset="UTF-8"> 微信<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>@H_<a href="/tag/502/" target="_blank" class="keywords">502</a>_8@ </head> <body> </body> <script src="http://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' ] }); <p>wx.ready(function() {</p> <p>wx.onMenuShareTimeline({<br /> title: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/biaoti/" target="_blank" class="keywords">标题</a><br /> link: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/lianjie/" target="_blank" class="keywords">链接</a><br /> imgUrl: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>图标<br /> success: function() {<br /> // <a href="/tag/yonghu/" target="_blank" class="keywords">用户</a>确认<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/houzhixing/" target="_blank" class="keywords">后执行</a>的回调<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a><br /> },cancel: function() {<br /> // <a href="/tag/yonghu/" target="_blank" class="keywords">用户</a>取消<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/houzhixing/" target="_blank" class="keywords">后执行</a>的回调<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a><br /> }<br /> });</p> <p>wx.onMenuShareAppMessage({<br /> title: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/biaoti/" target="_blank" class="keywords">标题</a><br /> desc: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>描述<br /> link: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>图标<br /> type: '',// <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>类型,music、video或link，不填默认为link<br /> dataUrl: '',// 如果type是music或video，则要提供数据<a href="/tag/lianjie/" target="_blank" class="keywords">链接</a>，默认为空<br /> success: function() {<br /> // <a href="/tag/yonghu/" target="_blank" class="keywords">用户</a>确认<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/houzhixing/" target="_blank" class="keywords">后执行</a>的回调<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a><br /> },cancel: function() {<br /> // <a href="/tag/yonghu/" target="_blank" class="keywords">用户</a>取消<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/houzhixing/" target="_blank" class="keywords">后执行</a>的回调<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a><br /> }<br /> });</p> <p>});</p> </script> </html> </pre> </div> <p>上面是一个<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a><a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>，这样的<a href="/tag/daima/" target="_blank" class="keywords">代码</a>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<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>和HTML分离，要实现<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/gongneng/" target="_blank" class="keywords">功能</a>，首先就是要<a href="/tag/diaoyong/" target="_blank" class="keywords">调用</a>用微信的jssdk Api<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>到配置参数，这个必须是要通过<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a><a href="/tag/houtai/" target="_blank" class="keywords">后台</a>语言来<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>的，然后将这些参数配置于wx.config中，在wx.config之前要先引入<span style="color: #3366ff"><h3>http://res.wx.qq.com/open/js/jweixin-1.0.0.js</h3> 然后就可以写<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>的<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>了，他们的依赖关系是wx.config 需要js库和config内部的参数，<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>依赖wx.config 所以最重要的就把<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>的配置参数分离出来单独<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>即可</p> <p><h3><a href="/tag/jiejuefang/" target="_blank" class="keywords">解决方</a>案</h3> 将<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>配置参数的<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>写作为接口，在js里使用ajax<a href="/tag/diaoyong/" target="_blank" class="keywords">调用</a>，<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>参数并转换为对象，再通过回调<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>将ajax<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>的参数塞到wx.config中</p> <p><a href="/tag/daima/" target="_blank" class="keywords">代码</a>结构及<a href="/tag/gongneng/" target="_blank" class="keywords">功能</a></p> <p style="text-align: center"><p class="pic_center"><img id="theimg" alt="" onclick="window.open(this.src)" src="https://files.jb51.cc/file_images/article/201603/201639102801401.png?201629102810" /></p> </p> <ul> <li><h3><span style="color: #333333">index.html <a href="/tag/yemian/" target="_blank" class="keywords">页面</a>入口</h3></li> <li><h3><span style="color: #333333">weixin.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a> 服务器端<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>配置参数</h3></li> <li><h3><span style="color: #333333">configdata.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>将配置转为借口<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a></h3></li> <li><h3><span style="color: #333333">getconfig.js 用ajax<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>configdata.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>的数据</h3></li> <li><h3><span style="color: #333333">share.js <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>回调函</h3></li> <li><h3><span style="color: #333333">webpack.config.js webpack<a href="/tag/peizhiwenjian/" target="_blank" class="keywords">配置文件</a></h3></li> <li><h3><span style="color: #333333">index.js 打包后最终html<a href="/tag/diaoyong/" target="_blank" class="keywords">调用</a>js<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a></h3></li> </ul> <p><span style="color: #800000"><h3>index.html html@R_<a href="/tag/403/" target="_blank" class="keywords">403</a>_356@</h3></p> <div class="jb51code"> <pre class="brush:xhtml;"> <!DOCTYPE html> <html lang="en"> <head> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> charset="UTF-8"> <title>静态<a href="/tag/yemian/" target="_blank" class="keywords">页面</a>微信<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>测试@H_<a href="/tag/502/" target="_blank" class="keywords">502</a>_8@ </head> <body> <script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> <script src="statics/js/index.js"></script> </body> </html></pre> </div> <p><span style="color: #800000"><h3>configdata.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a> <a href="/tag/houtai/" target="_blank" class="keywords">后台</a><a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>配置的参数 </h3>注意url要写上自己被<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>的<a href="/tag/yemian/" target="_blank" class="keywords">页面</a>url不然会报invalid signature<a href="/tag/cuowu/" target="_blank" class="keywords">错误</a></p> <div class="jb51code"> <pre class="brush:<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>;"> <?php class JSSDK { private $appId; private $appSecret; <p>public function __construct($appId,$appSecret) {<br /> $this->appId = $appId;<br /> $this->appSecret = $appSecret;<br /> }</p> <p>public function getSignPackage() {<br /> $jsapiTicket = $this->getJsApiTicket();<br /> $url = "<a href="http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI">http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI</a>]";<br /> $timestamp = time();<br /> $nonceStr = $this->createNonceStr();</p> <p>// 这里参数的顺序要按照 key 值 ASCII 码升序排序<br /> $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";</p> <p>$signature = sha1($string);</p> <p>$signPackage = array(<br /> "appId" => $this->appId,"nonceStr" => $nonceStr,"timestamp" => $timestamp,"url" => $url,"signature" => $signature,"rawString" => $string<br /> );<br /> return $signPackage;<br /> }</p> <p>private function createNonceStr($length = 16) {<br /> $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";<br /> $str = "";<br /> for ($i = 0; $i < $length; $i++) {<br /> $str .= substr($chars,mt_rand(0,strlen($chars) - 1),1);<br /> }<br /> return $str;<br /> }</p> <p>private function getJsApiTicket() {<br /> // 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<br /> $data = json_decode(file_get_contents("jsapi_ticket.json"));<br /> if ($data->expire_time < time()) {<br /> $accessToken = $this->getAccessToken();<br /> $url = "<a href="https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken">https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken</a>";<br /> $res = json_decode($this->httpGet($url));<br /> $ticket = $res->ticket;<br /> if ($ticket) {<br /> $data->expire_time = time() + 7000;<br /> $data->jsapi_ticket = $ticket;<br /> $fp = fopen("jsapi_ticket.json","w");<br /> fwrite($fp,json_encode($data));<br /> fclose($fp);<br /> }<br /> } else {<br /> $ticket = $data->jsapi_ticket;<br /> }</p> <p>return $ticket;<br /> }</p> <p>private function getAccessToken() {<br /> // access_token 应该全局存储与更新，以下<a href="/tag/daima/" target="_blank" class="keywords">代码</a>以写入到<a href="/tag/wenjian/" target="_blank" class="keywords">文件</a>中做示例<br /> $data = json_decode(file_get_contents("access_token.json"));<br /> if ($data->expire_time < time()) {<br /> $url = "<a href="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret">https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret</a>";<br /> $res = json_decode($this->httpGet($url));<br /> $access_token = $res->access_token;<br /> if ($access_token) {<br /> $data->expire_time = time() + 7000;<br /> $data->access_token = $access_token;<br /> $fp = fopen("access_token.json",json_encode($data));<br /> fclose($fp);<br /> }<br /> } else {<br /> $access_token = $data->access_token;<br /> }<br /> return $access_token;<br /> }</p> <p>private function httpGet($url) {<br /> $curl = curl_init();<br /> curl_setopt($curl,CURLOPT_RETURNTRANSFER,true);<br /> curl_setopt($curl,CURLOPT_TIMEOUT,500);<br /> curl_setopt($curl,CURLOPT_URL,$url);</p> <p>$res = curl_exec($curl);<br /> curl_close($curl);</p> <p>return $res;<br /> }<br /> }</p> </pre> </div> <p><h3><span style="color: #800000">weixin.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a> 将配置参数格式化<a href="/tag/shuchu/" target="_blank" class="keywords">输出</a></h3></p> <div class="jb51code"> <pre class="brush:<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>;"> <?php <p>require_once "weixin.php";<br /> $jssdk = new JSSDK(appId,appSecretecret);<br /> $signPackage = $jssdk->GetSignPackage();</p> <p>class Config{<br /> var $appId;<br /> var $timestamp;<br /> var $nonceStr;<br /> var $signature;<br /> var $url;<br /> } </p> <p>$config = new Config(); </p> <p>$config -> appId = $signPackage["appId"];<br /> $config -> timestamp = $signPackage["timestamp"];<br /> $config -> nonceStr = $signPackage["nonceStr"];<br /> $config -> signature = $signPackage["signature"];<br /> $config -> url = $signPackage["url"]; </p> <p>echo json_encode($config);<br /> ?></p> </pre> </div> <p><span style="color: #800000"><h3>getconfig.js 使用ajax<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>接口数据（配置参数）</h3></p> <div class="jb51code"> <pre class="brush:js;"> var getConfig = function(callback) { $.ajax({ url: "http://www.goxueche.com/api/configdata.<a href="/tag/PHP/" target="_blank" class="keywords">PHP</a>",type: "get",success: function(data) { callback(data); } }) } <p>module.exports = getConfig;</p> </pre> </div> <p>share.js <a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a><a href="/tag/hanshu/" target="_blank" class="keywords">函数</a></p> <div class="jb51code"> <pre class="brush:js;"> var getWeixincofig = require("./getconfig.js"); getWeixincofig(shareweixin); <p>function shareweixin(data) {</p> <p>var data = JSON.parse(data);<br /> console.log(data);</p> <p>window.wx.config({<br /> debug:true,appId: data.appId,timestamp: data.timestamp,nonceStr: data.nonceStr,signature: data.signature,jsApiList: ['checkJsApi','onMenuShareTimeline','onMenuShareAppMessage']<br /> });</p> <p>wxShare();<br /> }</p> <p>function wxShare() {<br /> //检测api是否生效<br /> wx.ready(function() {<br /> wx.checkJsApi({<br /> jsApiList: [<br /> 'getNetworkType','previewImage'<br /> ],success: function(res) {<br /> console.log(JSON.stringify(res));<br /> }<br /> });<br /> //<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>给好友<br /> wx.onMenuShareAppMessage({<br /> title: '趣学车-有温度的互联网驾校',desc: '想去学车，就趣学车!',link: '<a href="http://www.goxueche.com',imgUrl">http://www.goxueche.com',imgUrl</a>: '<a href="http://www.goxueche.com/....png">http://www.goxueche.com/....png</a>'<br /> });</p> <p>//<a href="/tag/fenxiang/" target="_blank" class="keywords">分享</a>到朋友圈<br /> wx.onMenuShareTimeline({<br /> title: '趣学车-有温度的互联网驾校',imgUrl: '<a href="http://www.goxueche.com/....png">http://www.goxueche.com/....png</a>'<br /> });</p> <p>});<br /> }</p> </pre> </div> <p>webpack.config.js</p> <div class="jb51code"> <pre class="brush:js;"> var webpack = require('webpack'); module.exports = { entry: { index: './share.js',},output: { path: './',filename: '[name].js' } }; </pre> </div> 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