微信分享JSSDK

第一步：封装jssdk服务

   注意：jsapi_ticket 应该全局存储与更新，以下代码以写入到缓存里，本人是php-laravel

<?php
namespace App\Services;

use Illuminate\Support\Facades\Cache;

class Jssdk {
    private $appId;
    private $appSecret;

    public function __construct($appId, $appSecret) {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }


    public function getSignPackage($url='') {
        $jsapiTicket = $this->getJsApiTicket();
        // 注意 URL 一定要动态获取，不能 hardcode.
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        $url = $url?$url:"$protocol$_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() {
        $ticket = Cache::get('jsapi_ticket');
        if (empty($ticket)) {
            $accessToken = $this->getAccessToken();
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $res = json_decode(file_get_contents($url));
            $ticket = $res->ticket;
            if ($ticket) {
                $jsapi_ticket = $ticket;
                Cache::put('jsapi_ticket',$jsapi_ticket,3600);
            }
        }
        return $ticket;
    }

    private function getAccessToken() {
        $access_token = Cache::get('access_token');
        if (empty($access_token)) {
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode(file_get_contents($url),true);
            $access_token = $res['access_token'];
            if ($access_token) {
                Cache::put('access_token',$access_token,3600);
            }
        }
        return $access_token;
    }

    private function httpGet($url) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
        // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);
        curl_setopt($curl, CURLOPT_URL, $url);

        $res = curl_exec($curl);
        curl_close($curl);
        return $res;
    }
}

第二步：编写接口去调用上面Jssdk服务（get方式）

 public function WeChatShareConfig(Request $request){
        $appid          = config('wechat.official_account.default.app_id');
        $appsecret      = config('wechat.official_account.default.secret');
        $jssdk          = new Jssdk($appid,$appsecret);
        $wx_config    = $jssdk->GetSignPackage();
        return Response::success('成功!.',$wx_config);

    }

然后登陆微公众平台，拿到 AppID 和 AppSecret

第三、别忘了设置IP白名单

如果不设置IP白名单，访问接口会报 "errcode":40164 错误，前端会提示：undefine  index access_token

如下

{"errcode":40164,"errmsg":"invalid ip 183.134.166.139 ipv6 ::ffff:183.122.16

在公众平台如下位置添加IP白名单，完美解决！

第四：最后还有个最基本的操作：把域名加上去，大多数到这时候都加过了

然后找到功能设置 =>JS接口安全设置  里面添加上自己的域名

添加完，一切OK了！