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: '', // 必填，公众号的唯一标识
 timestamp: , // 必填，生成签名的时间戳
 nonceStr: '', // 必填，生成签名的随机串
 signature: '',// 必填，签名
 jsApiList: [] // 必填，需要使用的JS接口列表
});

{"access_token":"ACCESS_TOKEN","expires_in":7200}

{
 "errcode":0,
 "errmsg":"ok",
 "ticket":"bxLdikRXVbTPdHSM05e5u5sUoXNKd8-41ZO3MhKoyN5OfkWITDGgnr2fwJ0m9E8NYzWKVZvdVtaUgWvsdshFKA",
 "expires_in":7200
}

wx.ready(function(){
 // config信息验证后会执行ready方法，所有接口调用都必须在config接口获得结果之后，config是一个客户端的异步操作，所以如果需要在页面加载时就调用相关接口，则须把相关接口放在ready函数中调用来确保正确执行。对于用户触发时才调用的接口，则可以直接调用，不需要放在ready函数中。
});

public function actionTicket()
{
  //开启session
  session_start();
  //appId
  $appId = 'wx73d0c47a64aa5315';
  //secret
  $appSecret = 'aba2793c10623350f6aeee5a728099d3';
  if (!isset($_SESSION['ticket'])){
    //获取微信公众号全局唯一接口调用凭据access_token
    $result = $this->getAccessToken($appId, $appSecret);
    $accessToken = $result['access_token'];
    //获取jsapi_ticket
    $getTicket = $this->getTicket($accessToken);
    $ticket = $getTicket['ticket'];
    $_SESSION['ticket'] = $ticket;
  }
  //jsapi_ticket(公众号用于调用微信JS接口的临时票据)
  $ticket = $_SESSION['ticket'];
  //当前时间戳
  $timestamp = time();
  //随机字符串
  $noncestr = $this->getRandCode();
  //当前url
  $url = $this->getUrl();
  $params = [
    'jsapi_ticket' => $ticket,
    'timestamp' => $timestamp,
    'noncestr' => $noncestr,
    'url' => $url,
  ];
  $options = $this->urlParams($params);
  //获取签名
  $signature = sha1($options);
  //将appId，timestamp，noncestr，signature渲染到页面
  return $this->render('ticket', [
    'appId' => $appId,
    'timestamp' => $timestamp,
    'noncestr' => $noncestr,
    'signature' => $signature,
  ]);
}
/*
 * 获取jsapi_ticket
 */
public function getTicket($accessToken)
{
  $params = [
    'access_token' => $accessToken,
    'type' => 'jsapi',
  ];
  $urlParams = $this->urlParams($params);
  $ticketUrl = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket?' . $urlParams;
  $result = $this->http_curl($ticketUrl);
  return json_decode($result, true);
}
/*
 * 获取微信公众号的全局唯一接口调用凭据access_token
 */
public function getAccessToken($appId, $appSecret)
{
  $params = [
    'grant_type' => 'client_credential',
    'appid' => $appId,
    'secret' => $appSecret,
  ];
  $urlParams = $this->urlParams($params);
  $accessUrl = 'https://api.weixin.qq.com/cgi-bin/token?' . $urlParams;
  $result = $this->http_curl($accessUrl);
  return json_decode($result, true);
}
/*
 * 获取随机码
 */
function getRandCode($num = 16){
  $array = array(
    'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
    'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','v','z',
    '1','2','3','4','5','6','7','8','9','0',
  );
  $tmpstr='';
  $max = count($array);
  for($i=1; $i<=$num; $i++){
    $key = rand(0,$max-1); //'A' -> $array[0]
    $tmpstr .= $array[$key];
  }
  return $tmpstr;
}
/*
 * curl接口调用
 */
public function http_curl($url, $data=null) {
  $curl = curl_init();
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
  curl_setopt($curl, CURLOPT_POST, 1);
  curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
  $result = curl_exec($curl);
  curl_close($curl);
  return $result;
}
/*
 * 字符串拼接
 */
public function urlParams($params)
{
  ksort($params);
  reset($params);
  $options = '';
  foreach ($params as $key => $value) {
    $options .= $key . '=' . $value .'&';
  }
  $options = rtrim($options, '&');
  return $options;
}
/*
 * 获取当前url
 */
public function getUrl()
{
  //获取协议类型
  $protocalPort = isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443' ? 'https://' : 'http://';
  //获取当前执行脚本的url
  $phpSelf = $_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME'];
  $pathInfo = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
  $queryString = isset($_SERVER['QUERY_STRING']) ? $_SERVER['QUERY_STRING'] : '';
  $relateUrl = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $phpSelf . (!empty($queryString) ? '?' . $queryString : $pathInfo);
  $url = $protocalPort . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '') . $relateUrl;
  return $url;
}