微信公众号开发（四） -- 自定义分享样式

1.微信的分享接口调用其实相当于是重写了个接口，自定义的是分享样式
2.位置还是右上角的三个点点

首先获取jssdk
因为我的token是储存在数据库里的，所以只要appid和token
没有的话需要加一步获取token值

<?php
class JSSDK {
  private $appId;
  private $access_token;

  public function __construct($appId, $access_token) {
    $this->appId = $appId;
    $this->access_token = $access_token;
  }

  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]";

    $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() {
      $accessToken = $this->access_token;
      $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
      $res = json_decode($this->httpGet($url));
      $ticket = $res->ticket;

    return $ticket;
  }

  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;
  }
}

调用分享接口
因为wx.ready相当于加载页面的同时就已经加载了，一定放在最外面。
还是右上角三个点点分享

<?php
require('jssdk.php');
$wechat = $db->getRow("SELECT access_token,appid FROM `wechat`");//从数据库获取appid和token
$jssdk = new JSSDK($wechat['appid'], $wechat['access_token']);
$signPackage = $jssdk->GetSignPackage();
?>

<script>
wx.config({
    debug: false, //调试是否开启
    appId: '<?php echo $signPackage["appId"];?>',
    timestamp: '<?php echo $signPackage["timestamp"];?>',
    nonceStr: '<?php echo $signPackage["nonceStr"];?>',
    signature: '<?php echo $signPackage["signature"];?>',
    jsApiList: [
                'checkJsApi',
                'onMenuShareTimeline',//
                'onMenuShareAppMessage',
                'onMenuShareQQ',
                'onMenuShareWeibo'
                ]
        
  });
window.share_config = {
	     "share": {
	        "imgUrl": 'http://jiashijia.137oa.com/<?= $data['headerUrl'] ?>',//分享图，默认当相对路径处理，所以使用绝对路径的的话，“http://”协议前缀必须在。
	        "desc" : '<?= $data['valuation'] ?>',//摘要,如果分享到朋友圈的话，不显示摘要。
	        "title" : '家事佳推荐:<?= $data['uname'] ?>',//分享卡片标题
	        "link": 'http://<?= $_SERVER[HTTP_HOST].$_SERVER[REQUEST_URI] ?>',//分享出去后的链接，这里可以将链接设置为另一个页面。
	        "success":function(){//分享成功后的回调函数
	        },
	        'cancel': function () { 
	            // 用户取消分享后执行的回调函数
	        }
	    }
	}; 
	wx.ready(function () {
	    wx.onMenuShareAppMessage(share_config.share);//分享给好友
	    wx.onMenuShareTimeline(share_config.share);//分享到朋友圈
	    wx.onMenuShareQQ(share_config.share);//分享给手机QQ

	    function weixinSendAppMessage(title,desc,link,imgUrl){
	    	WeixinJSBridge.invoke('sendAppMessage',{
	    	//"appid":appId,
	    	"img_url":imgUrl,
	    	//"img_width":"640",
	    	//"img_height":"640",
	    	"link":link,
	    	"desc":desc,
	    	"title":title
	    	});
	    }
	    
	});

</script>