我们现在用微信微博很多了,经常看见有人在群和朋友圈中分享文章,,我们分享出去的时候只是空白链接,但是别人分享的时候却带着漂亮的图片和标题描述,他们是怎么做到的呢??微信分享的代码分析:

下面我分享两段代码给大家看看就明白了:

1.当然是微信的SDK了,拿到微信的SDK参数:

class JSSDK {
    private $appId;
    private $appSecret;
    
    private $cache_key_jsticket;
    private $cache_key_token;
    public function __construct($appId='', $appSecret='') {
        $this->appId = $appId;
        $this->appSecret = $appSecret;

        $this->cache_key_jsticket = "wx_jsticket_" . $this->appId; 
        $this->cache_key_token = "wx_token_" . $this->appId; 
        
        
    }
    
    public function GetSignPackage() {
        $jsapiTicket = $this->getJsApiTicket();
        
        if (!empty($_SERVER['HTTP_X_PROTO']) && strtoupper($_SERVER['HTTP_X_PROTO']) == 'SSL') {
            $protocol = 'https';
        } else {
            $protocol = isset($_SERVER['REQUEST_SCHEME']) ? $_SERVER['REQUEST_SCHEME'] : 'https';
        }
        $protocol .= '://';
        $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        
        $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);
        
        $signPackage = array(
            "jsapiTicket"=>$jsapiTicket,
            "appId"     => $this->appId,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "url"       => $url,
            "signature" => $signature,
            "rawString" => $string
        );
        return $signPackage;
    }
    
    /**
     *生成16位随机字符串
     *@param  int
     *@return string
     */
    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
        $mc = new RedisManager();
        $data = json_decode($mc->get( $this->cache_key_jsticket ), true);
        if ( $data['expire_time'] < time() || empty($data['jsapi_ticket']) ) {
            $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";
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=$accessToken&type=jsapi";
            $res = json_decode($this->httpGet($url), true);
            
            if( $res['errcode'] == 40001 ){
                $mc->set($this->cache_key_jsticket, 0, '');
                $accessToken = $this->getAccessToken();
                $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=$accessToken&type=jsapi";
                $res = json_decode($this->httpGet($url), true);
            }
            
            $ticket = $res['ticket'];
            if ($ticket) {
                $data['expire_time'] = time() + 7000;
                $data['jsapi_ticket'] = $ticket;
                $mc->set($this->cache_key_jsticket, 7000, 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
        $mc= new Redis();
        $data = json_decode($mc->get( $this->cache_key_token ), true);
        if ( $data['expire_time'] < time() || empty($data['access_token']) ) {
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this->httpGet($url), true);
            $access_token = $res['access_token'];
            if ($access_token) {
                $data['expire_time'] = time() + 7000;
                $data['access_token'] = $access_token;
                $mc->set( $this->cache_key_token , 7000, json_encode($data));
            }
        } else {
            $access_token = $data['access_token'];
        }
        return $access_token;
    }
    
    /**
     *获取网页access_token
     *@param  string
     *@return string
     */
    public function wap_access_token($code){
        $appid = $this->appId;
        $secret = $this->appSecret;
        $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
        $rs = json_decode($this->httpGet($url),true);
        return $rs;
    }
    
    
}

2.接下来是最关键的代码,涉及到js参数的运用:

<script src="//res.wx.qq.com/open/js/jweixin-1.1.0.js"></script>
<script>
var signPackage = eval(([$signPackage]));
var wxShareData1 = {
    "title": "这一刻xxx",
    "desc": "描述描述描述",
    "link": location.href,
    "imgUrl": "http://www.baidu.com/logo.jpg",
};

var userAgent = navigator.userAgent;
var pattern_wx = /MicroMessenger/;

var share = share || {};
var share = {
    wxInit: function(){
        wx.onMenuShareTimeline(wxShareData);
        wx.onMenuShareAppMessage(wxShareData);
    }
}

if(pattern_wx.test(userAgent)){
    wx.config({
        debug: false,
        appId: signPackage['appId'],
        timestamp: signPackage['timestamp'],
        nonceStr: signPackage['nonceStr'],
        signature: signPackage['signature'],
        jsApiList: [
            // 所有要调用的 API 都要加到这个列表中
            'onMenuShareTimeline',
            'onMenuShareAppMessage'
        ]
    });
    wx.ready(function () {
        wxShareData = wxShareData1;
        share.wxInit();
    });
}


function setshare(){
    if(pattern_wx.test(userAgent)){
        share.wxInit();
    }
    if(pattern_weibo.test(userAgent)){
        share.wbInit();
    }
}

</script>

以上两个步骤就是调用微信的来分享文章的步骤了,快去试试把

转载请注明：SuperIT » (原创)两个步骤教你使用微信分享到朋友和朋友圈,微信分享的代码分析