解决网站html页面微信转发调用缩略图的问题

php文件。

<?php//$url = $_GET['url'];class JSSDK {    private $appId;    private $appSecret;    public function __construct($appId, $appSecret) {        $this->appId = $appId;        $this->appSecret = $appSecret;    }    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://" : "http://";        $url =  $_GET['url'];        $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=$nonceStr×tamp=$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 应该全局存储与更新，以下代码以写入到文件中做示例        $data = json_decode($this->get_php_file("jsapi_ticket.php"));        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;                $this->set_php_file("jsapi_ticket.php", json_encode($data));            }        } 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        $data = json_decode($this->get_php_file("access_token.php"));        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;                $this->set_php_file("access_token.php", json_encode($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($curl, CURLOPT_TIMEOUT, 500);        // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。        // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。        curl_setopt($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 $res;    }    private function get_php_file($filename) {        return trim(substr(file_get_contents($filename), 15));    }    private function set_php_file($filename, $content) {        $fp = fopen($filename, "w");        fwrite($fp, "<?php exit();?>" . $content);        fclose($fp);    }}$jssdk = new JSSDK("wx1d7ee02112d09e96", "5d3b8fc6f988c6a4313f4e913c11548a");$signPackage = $jssdk->GetSignPackage();class Emp {    public $appId = "";    public $timestamp  = "";    public $noncestre = "";    public $signature="";}$e = new Emp();$e->appId = $signPackage["appId"];$e->timestamp  = $signPackage["timestamp"];$e->noncestre = $signPackage["nonceStr"];$e->signature = $signPackage["signature"];//动态执行回调函数$callback=$_GET['callback'];echo $callback."(".json_encode($e).")";?>

html中ajax调用：

<script language="javascript" type="text/javascript" src="http://www.XXX.cn/js/jquery.js"></script><script type="text/javascript" src="http://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script><script type="text/javascript">$.ajax({url: "http://www.XXX.cn/e/wap/template/1/weixin.php",dataType: "jsonp",type: "get",data: {"url": document.location.href.split('#')[0]},success: function(res) {wx.config({debug: false,appId: res.appId,timestamp: res.timestamp,nonceStr: res.noncestre,signature: res.signature,jsApiList: ['onMenuShareAppMessage', 'onMenuShareTimeline']});wx.ready(function() {var shareData = {title: '喜迎十九大-科技网”',desc: '中国共产党第十九次全国代表大会于2017年10月18日在北京召开。大会将选举产生新一届中央委员会和中央纪律检查委员会',//  link: '',imgUrl: 'http://www.XXX.cn/images/wxlogo.jpg'};wx.onMenuShareAppMessage(shareData);wx.onMenuShareTimeline(shareData);});wx.error(function(err){});},error: function(res){}});</script>