javascript获取wx.config内部字段解决微信分享

背景

在微信分享开发的时候我们通常的流程是

rush:PHP;"> GetSignPackage(); ?> <Meta charset="UTF-8">

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

• 页面入口

• PHP 服务器端获取配置参数

• figdata.PHP将配置转为借口输出

• fig.js 用ajax获取configdata.PHP的数据

• 分享回调函

• fig.js webpack配置文件

• 调用js文件

index.html html静态文件

rush:xhtml;"> <Meta charset="UTF-8">

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

rush:PHP;"> 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();
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$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;
$fp = fopen("access_token.json",json_encode($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;
}
}

PHP 将配置参数格式化输出

rush: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）

rush:js;"> 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

rush:js;"> 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',imgurl: 'http://www.goxueche.com/....png'
});

});
}

webpack.config.js

rush:js;"> var webpack = require('webpack'); module.exports = { entry: { index: './share.js',},output: { path: './',filename: '[name].js' } };

本文已被整理到了《》，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：小编为大家精心整理的，希望喜欢。

以上就是本文的全部内容，希望对大家的学习有所帮助。