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 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
<?phpclass 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。
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