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javascript取得wx.config內部欄位解決微信分享_javascript技巧

WBOY
WBOY原創
2016-05-16 15:11:211570瀏覽

背景
在微信分享開發的時候我們通常的流程是

 <&#63;php
 require_once "jssdk.php";
 $jssdk = new JSSDK("yourAppID", "yourAppSecret");
 $signPackage = $jssdk->GetSignPackage();
&#63;>
 <!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: '<&#63;php echo $signPackage["appId"];&#63;>',
  timestamp: <&#63;php echo $signPackage["timestamp"];&#63;>,
  nonceStr: '<&#63;php echo $signPackage["nonceStr"];&#63;>',
  signature: '<&#63;php echo $signPackage["signature"];&#63;>',
  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>

上面是一個php文件，這樣的程式碼的一個很大缺點是前後端未分離耦合度太高，再一就是混合寫不是很美觀，所以我們要讓PHP和HTML分離，要實現分享功能，首先就是要呼叫用微信的jssdk Api取得到設定參數， 這個必須是要透過php後台語言來取得的，然後將這些參數配置於wx.config中，在wx.config之前要先引入http://res.wx.qq.com/open/js/jweixin-1.0.0.js 然後就可以寫分享的函數了，他們的依賴關係是wx.config 需要js庫和config內部的參數，分享依賴wx.config
所以最重要的就把php的配置參數分開來單獨取得即可

解
將獲取配置參數的PHP寫作為接口，在js裡使用ajax調用，獲取參數並轉換為對象，再通過回調函數將ajax獲取的參數塞到wx.config中

程式碼結構及功能


  • index.html 頁面入口
  • weixin.php 伺服器端取得設定參數
  • configdata.php將設定轉換為藉口輸出
  • getconfig.js 用ajax取得configdata.php的資料
  • share.js 分享回呼函
  • webpack.config.js webpack設定檔
  • index.js 打包後最終html呼叫js檔

index.html html靜態檔案

<!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 後台取得配置的參數 注意url要寫上自己被分享的頁面url不然會報invalid signature錯誤

 <&#63;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=$nonceStr&timestamp=$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();
 $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket&#63;type=jsapi&access_token=$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()) {
 $url = "https://api.weixin.qq.com/cgi-bin/token&#63;grant_type=client_credential&appid=$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 將設定參數格式化輸出

 <&#63;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);
&#63;>

getconfig.js 使用ajax取得介面資料（設定參數）

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 分享函數

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'
 }
};

以上就是本文的全部內容，希望對大家的學習有所幫助。

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