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=$nonceStr×tamp=$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;
}
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
// $url = "https://qyapi./cgi-bin/get_jsapi_ticket?access_token=$accessToken";
$url = "https://api./cgi-bin/ticket/getticket?type=jsapi&access_token=$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
// $url = "https://qyapi./cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
$url = "https://api./cgi-bin/token?grant_type=client_credential&appid=$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 : "/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。
.5.21更新：引入js文件更新
