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  • javascript获取wx.config内部字段解决微信分享

    转自:http://www.jb51.net/article/80679.htm

    专题推荐:js微信开发_脚本之家

    http://www.jb51.net/Special/879.htm

    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="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'
     ] 
     }); 
      
     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http://res.wx.qq.com/open/js/jweixin-1.0.0.js 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

    • 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="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> 
     <script src="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=$nonceStr×tamp=$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

    <?php 
      
     require_once "weixin.php"; 
     $jssdk = new JSSDK(appId, appSecretecret); 
     $signPackage = $jssdk->GetSignPackage(); 
       
     class Config{  
     var $appId;  
     var $timestamp;  
     var $nonceStr;  
     var $signature;  
     var $url; 
     }  
       
     $config = new Config();  
       
     $config -> appId = $signPackage["appId"];  
     $config -> timestamp = $signPackage["timestamp"];  
     $config -> nonceStr = $signPackage["nonceStr"];  
     $config -> signature = $signPackage["signature"]; 
     $config -> url = $signPackage["url"];  
       
     echo json_encode($config); 
    ?>
    

    getconfig.js 使用ajax获取接口数据(配置参数)

    var getConfig = function(callback) { 
     $.ajax({ 
     url: "http://www.goxueche.com/api/configdata.php", 
     type: "get", 
     success: function(data) { 
     callback(data); 
     } 
     }) 
    } 
      
    module.exports = getConfig;
    

      

    share.js 分享函数

    var getWeixincofig = require("./getconfig.js"); 
    getWeixincofig(shareweixin); 
      
      
    function shareweixin(data) { 
      
     var data = JSON.parse(data); 
     console.log(data); 
      
     window.wx.config({ 
     debug:true, 
     appId: data.appId, 
     timestamp: data.timestamp, 
     nonceStr: data.nonceStr, 
     signature: data.signature, 
     jsApiList: ['checkJsApi', 'onMenuShareTimeline', 'onMenuShareAppMessage'] 
     }); 
      
     wxShare(); 
    } 
      
    function wxShare() { 
     //检测api是否生效 
     wx.ready(function() { 
     wx.checkJsApi({ 
     jsApiList: [ 
     'getNetworkType', 
     'previewImage'
     ], 
     success: function(res) { 
     console.log(JSON.stringify(res)); 
     } 
     }); 
     //分享给好友 
     wx.onMenuShareAppMessage({ 
     title: '趣学车-有温度的互联网驾校', 
     desc: '想去学车,就趣学车!', 
     link: 'http://www.goxueche.com', 
     imgUrl: 'http://www.goxueche.com/....png'
     }); 
       
     //分享到朋友圈 
     wx.onMenuShareTimeline({ 
     title: '趣学车-有温度的互联网驾校', 
     desc: '想去学车,就趣学车!', 
     link: 'http://www.goxueche.com', 
     imgUrl: 'http://www.goxueche.com/....png'
     }); 
      
     }); 
    }
    

      

    webpack.config.js

    var webpack = require('webpack');  
    module.exports = {  
     entry: { 
     index: './share.js', 
     }, 
     output: { 
     path: './', 
     filename: '[name].js'
     } 
    };
    

    本文已被整理到了《JavaScript微信开发技巧汇总》,欢迎大家学习阅读。

    为大家推荐现在关注度比较高的微信小程序教程一篇:《微信小程序开发教程》小编为大家精心整理的,希望喜欢。

    以上就是本文的全部内容,希望对大家的学习有所帮助。

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  • 原文地址:https://www.cnblogs.com/itfantasy/p/6907821.html
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