使用javascript擷取wx.config内部字段解決微信分享

背景

在微信分享開發的時候我們通常的流程是

<?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: '', // 分享标題
                link: '', // 分享連結
                imgUrl: '', // 分享圖示
                success: function() {
                    // 使用者确認分享後執行的回調函數
                },
                cancel: function() {
                    // 使用者取消分享後執行的回調函數
                }
            });

            wx.onMenuShareAppMessage({
                title: '', // 分享标題
                desc: '', // 分享描述
                link: '', // 分享連結
                imgUrl: '', // 分享圖示
                type: '', // 分享類型,music、video或link，不填預設為link
                dataUrl: '', // 如果type是music或video，則要提供資料連結，預設為空
                success: function() {
                    // 使用者确認分享後執行的回調函數
                },
                cancel: function() {
                    // 使用者取消分享後執行的回調函數
                }
            });

        });
    </script>

    </html>

上面是一個php檔案，這樣的代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，是以我們要讓PHP和HTML分離，要實作分享功能，首先就是要調用用微信的jssdk Api擷取到配置參數，這個必須是要通過php背景語言來擷取的，然後将這些參數配置于wx.config中，在wx.config之前要先引入http://res.wx.qq.com/open/js/jweixin-1.0.0.js 然後就可以寫分享的函數了，他們的依賴關系是wx.config 需要js庫和config内部的參數，分享依賴wx.config

是以最重要的就把php的配置參數分離出來單獨擷取即可

解決方案

将擷取配置參數的PHP寫作為接口，在js裡使用ajax調用，擷取參數并轉換為對象，再通過回調函數将ajax擷取的參數塞到wx.config中

代碼結構及功能

index.html 頁面入口
weixin.php 伺服器端擷取配置參數
configdata.php将配置轉為借口輸出
getconfig.js 用ajax擷取configdata.php的資料
share.js 分享回調函
webpack.config.js webpack配置檔案
index.js 打包後最終html調用js檔案

index.html html靜态檔案

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>靜态頁面微信分享測試</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 背景擷取配置的參數注意url要寫上自己被分享的頁面url不然會報invalid signature錯誤

<?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();

    // 這裡參數的順序要按照 key 值 ASCII 碼升序排序
    $string = "jsapi_ticket=$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 應該全局存儲與更新，以下代碼以寫入到檔案中做示例
    $data = json_decode(file_get_contents("jsapi_ticket.json"));
    if ($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 應該全局存儲與更新，以下代碼以寫入到檔案中做示例
    $data = json_decode(file_get_contents("access_token.json"));
    if ($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 将配置參數格式化輸出

<?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擷取接口資料（配置參數）

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() {
  //檢測api是否生效
  wx.ready(function() {
    wx.checkJsApi({
      jsApiList: [
        'getNetworkType',
        'previewImage'
      ],
      success: function(res) {
        console.log(JSON.stringify(res));
      }
    });
    //分享給好友
    wx.onMenuShareAppMessage({
      title: '趣學車-有溫度的網際網路駕校',
      desc: '想去學車，就趣學車!',
      link: 'http://www.goxueche.com',
      imgUrl: 'http://www.goxueche.com/....png'
    });
    
    //分享到朋友圈
    wx.onMenuShareTimeline({
      title: '趣學車-有溫度的網際網路駕校',
      desc: '想去學車，就趣學車!',
      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'
    }
};

webpack打包

檢視分享效果

參考文檔

http://203.195.235.76/jssdk/ http://www.cnblogs.com/txw1958/p/weixin-js-sdk-demo.html

使用javascript擷取wx.config内部字段解決微信分享

背景

解決方案

代碼結構及功能

參考文檔

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