小程序下如何获取access_token（代码示例）

<button>获取token</button>

// pages/token/token.jsPage({  data: {  },  token:function(){    wx.request({      url: 'xxxx',      data:{},      success:function(res){        console.log(res.data);        //这里我是用的新浪云的sae,所以存在读写权限问题，打印出来的信息会存在告警      }    });  }})

<?php  exit();?>{"access_token":"","expire_time":0}

<?php   //验证  function getToken(){    $timestamp = $_GET["timestamp"];    $nonce =$_GET["nonce"];    $token="hello hqtoken";    $signature=$_GET["signature"];    $array=array($timestamp,$nonce,$token);    sort($array);    $tmpstr=implode("",$array);    $tmpstr=sha1($tmpstr);    if($tmpstr == $signature){      echo $_GET["echostr"];      exit;    }  }  //获取AccessToken  function getAccessToken(){    $appid="你的appid";    $appsecret = "你的appsecret";    //文件存储    $data=json_decode(get_php_file("access_token.php"));    if($data->expire_time<time>access_token;      if($access_token){        $data-&gt;expire_time=time()+7000;        $data-&gt;access_token=$access_token;        set_php_file("access_token.php",json_encode($data));      }    }else{      $access_token=$data-&gt;access_token;    }    return $access_token;  }  //公共的curl方法  function httpGet($url){    $curl = curl_init();    curl_setopt($curl,CURLOPT_URL,$url);    curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);    //如果用的是https，ssl安全验证    curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,false);    curl_setopt($curl,CURLOPT_SSL_VERIFYHOST,false);    $res =curl_exec($curl);    curl_close($curl);    return $res;  }  function get_php_file($filename){    return trim(substr(file_get_contents($filename),15));  }  function set_php_file($filename,$content){    $fp=fopen($filename,"w");    fwrite($fp,"<?php  exit();?>".$content);    fclose($fp);  }  echo getAccessToken();?&gt;</time>