微信分享网页的时候，希望分享出来的链接是标题+描述+缩略图，微信开发代码示例里已提供了方法，但只适用于动态页面。由于dedecms是生成了静态文件，其实我想使用ajax获取jssdk参数也能也能实现微信分享功能了，在这里分享给大家。

jssdk的步骤业务流程是这样滴：

1：在微信公众号后台配置js 安全域名，即需要引入jssdk的页面域名。 需要在域名根目录下放置微信的检测文件。

3：后台开发人员生成签名传递给前台

4：前端页面引入script方式 jssdk文件

5：通过ajax获取config 配置，完成config 配置后即可使用jssdk的各项功能了。

再补充啰嗦一句：

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，后台decodeURIComponent解码)，

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。

前台HTML代码示例：

var url=encodeURIComponent(window.location.href.split(‘#‘)[0]);//分享成功之后再次分享，微信会再url附带额外参数造成二次分享签名错误，这里处理下避免config：invalid signature签名失效

$.ajax({

type : "get",

url : "http://xxx/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: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印

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(JSON.stringify(data));

//alert("连接失败！");

}

});

wx.ready(function (){

var shareData = {

title: ‘标题‘,

desc: ‘简介‘,//这里请特别注意是要去除html

link: ‘链接‘,

imgUrl: ‘标题图‘

};

wx.onMenuShareAppMessage(shareData);

wx.onMenuShareTimeline(shareData);

wx.onMenuShareQQ(shareData);

wx.onMenuShareWeibo(shareData);

});

修改服务端文件jssdk.php

$url = urldecode($_GET[‘url‘]);

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();

$protocol = (!empty($_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";

$signature = sha1($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(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;

}

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(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;

}

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;

}

}

$jssdk = new JSSDK("公众号ID", "公众号密钥",$url);//按照自己的公众号填写

$signPackage = $jssdk->GetSignPackage();

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

$callback = $_GET[‘callback‘];

echo $callback.‘(‘.$tmp.‘)‘;

exit;

?>

其它的按照动态页面参数设置即可。