摘要：為了避免大家少走彎路，這里先介紹下硬性條件必須是通過認證的微信服務號或者微信企業號才具有此功能。有自己的云虛擬主機，也就是自己的網站。如果在部署過程中代碼在此處驗證失敗，請到下載新的證書判別文件。調通后，就可以出現下面的這個界面了

為了避免大家少走彎路，這里先介紹下硬性條件
1、必須是通過認證的微信服務號或者微信企業號才具有此功能。
2、有自己的云虛擬主機，也就是自己的網站。
開始配置：

一、公眾號號的設置
1、進入微信公眾平臺后臺，在公眾號設置->功能設置界面下配置好JS接口安全域名，如下圖

2、在基本配置里面完成IP白名單和服務器的配置，這步很重要，如下圖

二、網站代碼結構如下

weixin--|
        |---access_token.php
        |---airkiss.php                        //公眾號鏈接到該文件
        |---jsapi_ticket.php
        |---jssdk.php
        |---MP_verify_yfiF3OWtLI4GfhBg.txt    //JS接口驗證文件,在設置JS接口時下載后放到網站的，名稱隨機

三、代碼詳情
1、access_token.php

{"access_token":"","expire_time":0}

2、airkiss.php

GetSignPackage();
?>



  
  

3、jsapi_ticket.php

{"jsapi_ticket":"","expire_time":0}

4、jssdk.php

appId = $appId;
    $this->appSecret = $appSecret;
  }

  public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();

    // 注意 URL 一定要動態獲取，不能 hardcode.
    $protocol = (!empty($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] !== "off" || $_SERVER["SERVER_PORT"] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

    $timestamp = time();
    $nonceStr = $this->createNonceStr();

    // 這里參數的順序要按照 key 值 ASCII 碼升序排序
    $string = "jsapi_ticket=$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 應該全局存儲與更新，以下代碼以寫入到文件中做示例
    $data = json_decode($this->get_php_file("jsapi_ticket.php"));
    if ($data->expire_time < time()) {
      $accessToken = $this->getAccessToken();
      // 如果是企業號用以下 URL 獲取 ticket
      // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = json_decode($this->httpGet($url));
      $ticket = $res->ticket;
      if ($ticket) {
        $data->expire_time = time() + 7000;
        $data->jsapi_ticket = $ticket;
        $this->set_php_file("jsapi_ticket.php", json_encode($data));
      }
    } else {
      $ticket = $data->jsapi_ticket;
    }

    return $ticket;
  }

  private function getAccessToken() {
    // access_token 應該全局存儲與更新，以下代碼以寫入到文件中做示例
    $data = json_decode($this->get_php_file("access_token.php"));
    if ($data->expire_time < time()) {
      // 如果是企業號用以下URL獲取access_token
      // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$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;
        $this->set_php_file("access_token.php", json_encode($data));
      }
    } else {
      $access_token = $data->access_token;
    }
    return $access_token;
  }

  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    // 為保證第三方服務器與微信服務器之間數據傳輸的安全性，所有微信接口采用https方式調用，必須使用下面2行代碼打開ssl安全校驗。
    // 如果在部署過程中代碼在此處驗證失敗，請到 http://curl.haxx.se/ca/cacert.pem 下載新的證書判別文件。
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($curl, CURLOPT_URL, $url);

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

    return $res;
  }

  private function get_php_file($filename) {
    return trim(substr(file_get_contents($filename), 15));
  }
  private function set_php_file($filename, $content) {
    $fp = fopen($filename, "w");
    fwrite($fp, "" . $content);
    fclose($fp);
  }
}

調通后，就可以出現下面的這個界面了