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

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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'
 } 
};

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javascript获取wx.config内部字段解决微信分享

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