直接上代码：

这里面直接包含从前端到后端获取的

后端类处理请求和解密。

没appid 和 secret 的先去申请

我的框架 yii1.1

php5.6

nginx 忘了 也懒得看

1，index。js

//index.js

//获取应用实例

const app = getApp()

Page({

data: {

},

//登录获取code

login: function () {

wx.login({

success: function (res) {

console.log(res.code)

if(res.code) {

wx.getWeRunData({

success(ret){

let encryptedData = ret.encryptedData

console.log(ret);

// console.log("getWeRunData",encryptedData)加密的步数

wx.request({

url: 'http://abcd.com/test/weixin', //后端接口地址

data: {

code: res.code,

encryptedData: encryptedData,

iv: ret.iv,

},

header: {

'content-type': 'application/json' //默认值

},

success: function (res) {

console.log(res.data)

}

})

}

})

} else {

that.alert("huoqushibaii"+res.errMsg);

}

}

})

}

})

2，index.wxml

登录

3，//app.js

App({})```

4后端 php

class TestController extends BaseController{

public static $OK = 0;

public static $IllegalAesKey = -41001;

public static $IllegalIv = -41002;

public static $IllegalBuffer = -41003;

public static $DecodeBase64Error = -41004;

//测试微信获取步数

//获取 open_id sessionkey

public function actionWeixin()

{

//声明CODE，获取小程序传过来的CODE

$code = $_GET["code"];

//配置appid

$appid = 'wxa9asdasdafasf88a07e6a78478e';//我乱写的 用自己之前申请了的

//配置appscret

$secret = 'e82f5661asda6dda21a sc5b3534adsc571bf5783f';//我乱写的 用自己之前申请了的

//api接口

$url = "https://api.weixin.qq.com/sns/jscode2session?appid={$appid}&secret={$secret}&js_code={$code}&grant_type=authorization_code";

//获取GET请求

$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);

curl_setopt($curl, CURLOPT_URL, $url);

$res = curl_exec($curl);

curl_close($curl);

$res = json_decode($res);

//这里包含了sessionKey 和 openId

$sessionKey = $res->session_key;

// $openId = $res->open_id;

$encryptedData=$_GET["encryptedData"];//加密的步数

$iv = $_GET["iv"];//解密初始向量

//$pc = new WXBizDataCrypt($appid, $sessionKey);

//$errCode = $pc->decryptData($encryptedData, $iv, $data );

$errCode = $this->_decryptData($sessionKey,$appid,$encryptedData,$iv,$data);

if ($errCode == 0) {

print($data . "\n");

} else {

print($errCode . "\n");

}

}

//解密

public function _decryptData($sessionKey,$appid, $encryptedData, $iv, &$data )

{

if (strlen($sessionKey) != 24) {

return self::$IllegalAesKey;

}

$aesKey=base64_decode($sessionKey);

if (strlen($iv) != 24) {

return self::$IllegalIv;

}

$aesIV=base64_decode($iv);

$aesCipher=base64_decode($encryptedData);

$result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);

$dataObj=json_decode( $result );

if( $dataObj == NULL )

{

return self::$IllegalBuffer;

}

if( $dataObj->watermark->appid != $appid )

{

return self::$IllegalBuffer;

}

$data = $result;

return self::$OK;

}

}