微信jssdk自定义分享方法 js+php

要求：

1、需要一个公众号，实名认证，并且有分享接口权限

2、icp备案域名

微信公众平台配置就不说了。流程为：获取AppId、AppSecret ——>填写线上访问的安全域名——>下载MP-xxxx-xx.txt的文件（放在服务器根目录）。

接下来附上代码：

前端部分：

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<script>
window.onload = function(){
    $.support.cors = true;
    var url = location.href.split('#')[0];
    $.ajax({
        url: "xxxxxxxxx/index.php",
        type: "post",
        typeType: "json",
        data: {url:url},
        async: false,
        success: function(data) {
            var _data = data;
            var result = eval('('+ _data +')');
            appid = result.appId;
            timestamp = result.timestamp;
            nonceStr = result.nonceStr;
            signature = result.signature;
        },
    });
    wx.config({
        debug: false,
        appId: appid,
        timestamp: timestamp,
        nonceStr: nonceStr,
        signature: signature,
        jsApiList: [
            'onMenuShareAppMessage',
            'onMenuShareTimeline',
        ]
    });
    wx.ready(function() {
        wx.checkJsApi({
            jsApiList: [
                'onMenuShareAppMessage',
                'onMenuShareTimeline',
            ]
        })
        var shareData = {
            title: '项目的title',
            desc: '项目的描述',
            link: '项目网址',
            shareUrl: '分享网址',
            imgUrl: '分享的图标',
        };
        wx.onMenuShareAppMessage(shareData); //分享好友
        wx.onMenuShareTimeline(shareData);  //分享朋友圈
    });
} 
</script>

后台php：

index.php:

<?php
	#导入微信分享调用库
 	include('./jssdk/jssdk.php');
    $url =  $_POST["url"];
 	$appid = '你的开发者Id';
 	$appsecret = '你的开发者密码';
	$jssdk = new JSSDK($appid, $appsecret, $url);
	$signPackage = $jssdk->GetSignPackage();
	$appId = $signPackage['appId'];
	$timestamp = $signPackage['timestamp'];
	$nonceStr = $signPackage['nonceStr'];
	$signature = $signPackage['signature'];
	$data = array("appId"=>$appId,"timestamp"=>$timestamp,"nonceStr"=>$nonceStr,"signature"=>$signature); //返回给前端的数据
    //var_dump($trans_data);
	echo json_encode($data,true);
?>

 jssdk.php:

<?php
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();

    // 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 = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
    //$url = "http://www.manwei99.com/h5/gmj/index.html";
$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
    $data = json_decode($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);
  }
}

access_token.php:

<?php exit();?>
{"access_token":"","expire_time":0}

 jsapi_ticket.php:

<?php exit();?>
{"jsapi_ticket":"","expire_time":0}

效果：