var shareMsg = {
	appid:'wx******************',
	title: "分享标题",
	desc:"分享描述",
	image:'https://****/share.png', //分享方块小图，建议150×150正方形
	link: 'https://****'  //分享链接，必须和当前页面是同一个域名/子域名下的URL
}
 
//getSign.php为后端文件，代码在后面
var jsSignService = 'getSign.php';
function weixin(appid,callback){
	var _self = this;
	this.appid = appid;
	this.callback = callback;
	$.each(wx,function(k,v){
		weixin.prototype[k] = v;
	})
	for(var k in wx) {
		weixin[k] = wx[k];
	}
	if(this.callback){
		this.ready(this.callback);
	}
 
	$.getJSON(jsSignService,{'appid':this.appid,'url':location.href.split('#')[0]},function(response){
		_self.config({
			debug: false, // 开启调试模式
			appId: response.appId,
			timestamp: response.timestamp,
			nonceStr: response.nonceStr,
			signature: response.signature,
			jsApiList: [
				'checkJsApi',
				'onMenuShareTimeline',
				'onMenuShareAppMessage',
				'onMenuShareQQ',
				'onMenuShareWeibo',
				'updateAppMessageShareData',
				'updateTimelineShareData',]
		});
	});
}
$(function(){
	var wx = new weixin(shareMsg.appid,function(){
		wx.error(function(res){
			//用于查看回调失败的情形，辅助debug
			//alert(res);
		});
 
		wx.ready(function() {
			//如果页面有背景音乐，可以在这里直接开始播放，无需点击（超越手机浏览器协议）
			//document.getElementById("bg-music").play();
		});
		changeShareVal();
	});
})
 
function changeShareVal(){
	//微信好友/QQ好友/群聊
	wx.updateAppMessageShareData({
		title: shareMsg.title, // 分享标题
		desc: shareMsg.desc,  // 分享描述
		link: shareMsg.link, // 分享链接
		imgUrl: shareMsg.image, // 分享图标
		success: function () { // 分享成功后回调
		},
		cancel: function () { // 分享失败后回调
		}
	});
	//朋友圈/QQ空间
	wx.updateTimelineShareData({
		title: shareMsg.title, // 分享标题
		desc: shareMsg.desc,  // 分享描述
		link: shareMsg.link, // 分享链接
		imgUrl: shareMsg.image, // 分享图标
		success: function () { // 分享成功后回调
		},
		cancel: function () { // 分享失败后回调
		}
	});
}

error_reporting(E_ALL^E_NOTICE^E_WARNING);
class JSSDK {
	private $appId;
	private $appSecret;
 
	public function __construct($appId, $appSecret) {
		$this->appId = $appId;
		$this->appSecret = $appSecret;
	}
 
	public function getSignPackage() {
		$jsapiTicket = $this->getJsApiTicket();
		$url = $_GET['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，如无本地 jsapi_ticket 文件，此处会生成一个
		$data = json_decode(file_get_contents("jsapi_ticket.json"));
		if ($data->expire_time < time()) {
			$accessToken = $this->getAccessToken();
			$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$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，如无本地access_token 文件，此处会生成一个
		$data = json_decode(file_get_contents("access_token.json"));
		if ($data->expire_time < time()) {
			$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$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_URL, $url);
		$res = curl_exec($curl);
		curl_close($curl);
		return $res;
	}
}
 
$jssdk = new JSSDK("×××××", "×××××××");//此处填写服务号的APPID和APPSecret
$signPackage = $jssdk->GetSignPackage();
echo json_encode($signPackage);