實現方法：

在網站根目錄下新建js目錄，放入以下2個文件

js/jssdk.php
js/share.js

jssdk.php 代碼如下

<?php
$url = $_GET[‘url‘];//2017-06-27
class JSSDK {
private $appId;
private $appSecret;
private $url;//2017-06-27
public function __construct($appId, $appSecret,$url) {
$this->appId = $appId;
$this->appSecret = $appSecret;
$this->url = $url;//2017-06-27
}
public function getSignPackage() {
$jsapiTicket = $this->getJsApiTicket();
// 注意 URL 一定要動態獲取，不能 hardcode.
$protocol = (!empty($_SERVER[‘HTTPS‘]) && $_SERVER[‘HTTPS‘] !== ‘off‘ 
$_SERVER[‘SERVER_PORT‘] == 443) ? "https://" : "http://";
//$url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";//2017-06-27
$url =$this->url;//2017-06-27
$timestamp = time();
$nonceStr = $this->createNonceStr();
// 這里參數的順序要按照 key 值 ASCII 碼升序排序
$string = "jsapi_ticket=$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 應該全局存儲與更新，以下代碼以寫入到文件中做示例
$data = json_decode(file_get_contents("jsapi_ticket.json"));
if ($data->expire_time < time()) {
$accessToken = $this->getAccessToken();
// 如果是企業號用以下 URL 獲取 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 應該全局存儲與更新，以下代碼以寫入到文件中做示例
$data = json_decode(file_get_contents("access_token.json"));
if ($data->expire_time < time()) {
// 如果是企業號用以下URL獲取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, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true); //https
curl_setopt($curl, CURLOPT_URL, $url);
$res = curl_exec($curl);
curl_close($curl);
return $res;
}
}
$jssdk = new JSSDK("AAPID", "appSecret",$url);
$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;
?>

share.js代碼如下

url = location.href; $.ajax({
type: "get",
url: "../js/jssdk.php?url=" + url,
dataType: "jsonp",
jsonp: "callback",
jsonpCallback: "success_jsonpCallback",
success: function(data) {
wx.config({
appId: data.appId,
timestamp: data.timestamp,
nonceStr: data.nonceStr,
signature: data.signature,
jsApiList: [‘chackJsApi‘, ‘onMenuShareTimeline‘, ‘onMenuShareAppMessage‘,
‘onMenuShareQQ‘, ‘onMenuShareWeibo‘, ‘onMenuShareQZone‘]
});
},
error: function(data) {
alert("連接失敗！");
} }); wx.ready(function() {
var shareData = {
title: title,
desc: desc,
link: url,
imgUrl: img,
success: function(res) {
//分享成功
},
cancel: function(res) {
alert(‘已取消分享‘);
}
};
wx.onMenuShareAppMessage(shareData);
wx.onMenuShareTimeline(shareData);
wx.onMenuShareQQ(shareData);
wx.onMenuShareWeibo(shareData);
wx.onMenuShareQZone(shareData); });

部署方式 頁面底部添加如下代碼

<script src="https://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> <script src="https://你的域名/js/share.js"></script> <script> var url = ‘你的域名‘;//用戶要分享的網址 var title = ‘您的標題‘;//分享的標題 var img = ‘您的圖片地址‘;//分享的圖片 var desc = ‘您的描述信息‘;//分享的描述信息 </script>

這樣就可以了。