前端js

<script type="text/javascript" src="https://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script>

<script type="text/javascript">

var ul =  location.href.split('#')[0],

      url = encodeURIComponent(ul);

                 $.post("https://xx/wxjssdk.php?url="+url,{},function(data){

                    var data = data.msg;

                 wx.config({

                  debug: false,

                  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

                  ]

                 });

                 wx.ready(function (){

                  var shareData = {

                    title: '分享标题',

                    desc: '分享描述',

                    link: '分享链接',

                    imgUrl:'分享图片',

                  };

                  wx.onMenuShareAppMessage(shareData);

                  wx.onMenuShareTimeline(shareData);

                  wx.onMenuShareQQ(shareData);

                  wx.onMenuShareWeibo(shareData);

                    });

                },'json');

</script>

后端接口

<?php    

header('Content-Type: text/html;charset=utf-8');

header('Access-Control-Allow-Origin:*');

header('Access-Control-Allow-Methods:POST,GET,OPTIONS,DELETE');

header('Access-Control-Allow-Credentials: true');

header('Access-Control-Allow-Headers: Content-Type,Content-Length,Accept-Encoding,X-Requested-with, Origin');

$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=$nonceStr×tamp=$timestamp&url=$url";  //这里经常出问题,一般都是这里出现问题，要留意  

    $signature = sha1($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()) {    

      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$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;    

  }    

}    

$jssdk = new JSSDK("你的appid", "你的公众号的密钥",$url);

$signPackage = $jssdk->GetSignPackage();

$arr = array(

    "appId"=>$signPackage['appId'],

    "timestamp" => $signPackage["timestamp"],

    "nonceStr" => $signPackage["nonceStr"],

    "signature"=>$signPackage["signature"],

    "url" => $signPackage["url"]

);

echo json_encode(['msg'=>$arr]);

exit;    

?>