<script src="http://外部站点引入/js/jquery-1.11.1.min.js"></script>  

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<script>
var url=location.href;
  $.ajax({
    type : "get",
    url : "http://xxx/jssdk.php?url="+url,//替换网址，xxx根据自己jssdk文件位置修改
    dataType : "jsonp",
    jsonp: "callback",
    jsonpCallback:"success_jsonpCallback",
    success : function(data){
        wx.config({
　　　　 appId: data.appId,
　　　　 timestamp: data.timestamp,
　　　　 nonceStr: data.nonceStr,
　　　　 signature: data.signature,
　　　　jsApiList: [
       　　"onMenuShareTimeline", //分享给好友
       　　"onMenuShareAppMessage", //分享到朋友圈
       　　"onMenuShareQQ",  //分享到QQ
       　　"onMenuShareWeibo" //分享到微博
]
});
},
   error:function(data){
          alert("连接失败！");
     }
});
  wx.ready(function (){
  var shareData = {
  title: ‘标题‘,
  desc: ‘简介‘,//这里请特别注意是要去除html
  link: ‘链接‘,
  imgUrl: ‘标题图‘
  };
  wx.onMenuShareAppMessage(shareData);
  wx.onMenuShareTimeline(shareData);
  wx.onMenuShareQQ(shareData);
  wx.onMenuShareWeibo(shareData);
    });
</script>

<?php
$url = $_GET[‘url‘];
class JSSDK {
  private $appId;
  private $appSecret;
  private $url;
  public function __construct($appId, $appSecret,$url) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
$this->url = $url;
  }

  public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();
    $protocol = (!empty($_SERVER[‘HTTPS‘]) && $_SERVER[‘HTTPS‘] !== ‘off‘ || $_SERVER[‘SERVER_PORT‘] == 443) ? "https://" : "http://";
   // $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
$url =$this->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=$nonceStr&timestamp=$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, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);
    $res = curl_exec($curl);
    curl_close($curl);
    return $res;
  }
}

$jssdk = new JSSDK("公众号ID", "公众号密钥",$url);//按照自己的公众号填写
$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;
?>