javascript获取wx.config内部字段解决微信分享

时间:2020-05-15 Leinov 人气:0

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。

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