在前一篇文章《微信转发或分享朋友圈带缩略图、标题和描述的实现方法》中，余斗已经教大家如何实现在自有网站上实现微信分享后自带缩略图、标题和描述，这里是在动态php页面中实现，这里有很大的局限性，想要在静态页面中实现这个功能则需要进一步开发，这里就要用到大ajax技术，在这里分享给大家。

服务端文件jssdk.php代码：

$url = $_GET['url'];

classJSSDK {

private$appId;

private$appSecret;

private$url;

publicfunction __construct($appId, $appSecret,$url) {

$this->appId = $appId;

$this->appSecret = $appSecret;

$this->url = $url;

}

publicfunction 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"; //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;

}

privatefunction createNonceStr($length = 16) {

$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

$str = "";

for($i = 0; $i < $length; $i++) {

$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);

}

return$str;

}

privatefunction 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;

}

privatefunction 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;

}

privatefunction 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;

}

}

$jssdk = newJSSDK("APPID", "APPSECRET",$url);//按照自己的公众号填写

$signPackage = $jssdk->GetSignPackage();

// var_dump($signPackage);

$tmp=json_encode(array ('appId'=>$signPackage["appId"],'timestamp'=>$signPackage["timestamp"],'nonceStr'=>$signPackage["nonceStr"],'signature'=>$signPackage["signature"],'url'=>$signPackage["url"]));

$callback = $_GET['callback'];

echo $callback.'('.$tmp.')';

exit;

?>

静态页面js代码：

url = location.href.split('#')[0];

url = encodeURIComponent(url);

$.ajax({

type : "get",

url : "http://xxxxx.com/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({

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

]

});

},

error:function(data){

alert("连接失败！");

}

});

wx.ready(function (){

var shareData = {

title: '更换标题',

desc: '更换内容',//这里请特别注意是要去除html

link: '更换链接',

imgUrl: '更换图片'

};

wx.onMenuShareAppMessage(shareData);

wx.onMenuShareTimeline(shareData);

wx.onMenuShareQQ(shareData);

wx.onMenuShareWeibo(shareData);

});

配置好jssdk.php文件后，只需要把js代码加入到静态页面模版中即可。

还有一个地方需要注意的是还有script获取的地址一定是要转码过的，不带#的，下面这段话是微信官方给的

确保你获取用来签名的url是动态获取的，动态页面可参见实例代码中php的实现方式。如果是html的静态页面在前端通过ajax将url传到后台签名，前端需要用js获取当前页面除去'#'hash部分的链接(可用location.href.split('#')[0]获取,而且需要encodeURIComponent)，因为页面一旦分享，微信客户端会在你的链接末尾加入其它参数，如果不是动态获取当前链接，将导致分享后的页面签名失败。

2018.5.21更新：引入js文件更新