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在网站根目录下新建js目录，放入以下2个文件

js/jssdk.php
js/share.js

jssdk.php 代码如下

    <?php     $url = $_GET['url'];//2017-06-27     class JSSDK {       private $appId;       private $appSecret;       private $url;//2017-06-27       public function __construct($appId, $appSecret,$url) {         $this->appId = $appId;         $this->appSecret = $appSecret;         $this->url = $url;//2017-06-27       }       public function getSignPackage() {         $jsapiTicket = $this->getJsApiTicket();         // 注意 URL 一定要动态获取，不能 hardcode.         $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ||          $_SERVER['SERVER_PORT'] == 443) ? "https://" : "";         //$url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";//2017-06-27         $url =$this->url;//2017-06-27                 $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();           // 如果是企业号用以下 URL 获取 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;             $fp = fopen("jsapi_ticket.json", "w");             fwrite($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()) {           // 如果是企业号用以下URL获取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;             $fp = fopen("access_token.json", "w");             fwrite($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_SSL_VERIFYPEER, true);         curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true); //https         curl_setopt($curl, CURLOPT_URL, $url);         $res = curl_exec($curl);         curl_close($curl);         return $res;       }     }     $jssdk = new JSSDK("AAPID", "appSecret",$url);     $signPackage = $jssdk->GetSignPackage();     $tmp=json_encode(array ('appId'=>$signPackage["appId"],'timestamp'=>$signPackage["timestamp"],     'nonceStr'=>$signPackage["nonceStr"],'signature'=>$signPackage["signature"],'url'=>$signPackage["url"]));     $callback = $_GET['callback'];     echo $callback.'('.$tmp.')';     exit;     ?>