<view wx:if="{{isHide}}">
  <view wx:if="{{canIUse}}" >
    <view class='header'>
      <image src='/images/icon/wx_login.png'></image>
    </view>
 
    <view class='content'>
      <view>申请获取以下权限</view>
      <text>获得你的公开信息(昵称，头像等)</text>
    </view>
 
    <button class='bottom' type='primary' open-type="getUserInfo" lang="zh_CN" bindgetuserinfo="bindGetUserInfo">
      授权登录
    </button>
  </view>
  <view wx:else>请升级微信版本</view>
</view>
 
<view wx:else>
  <view>我的首页内容</view>
</view>

.header {
  margin: 90rpx 0 90rpx 50rpx;
  border-bottom: 1px solid #ccc;
  text-align: center;
  width: 650rpx;
  height: 300rpx;
  line-height: 450rpx;
}
.header image {
  width: 200rpx;
  height: 200rpx;
}
.content {
  margin-left: 50rpx;
  margin-bottom: 90rpx;
}
.content text {
  display: block;
  color: #9d9d9d;
  margin-top: 40rpx;
}
.bottom {
  border-radius: 80rpx;
  margin: 70rpx 50rpx;
  font-size: 35rpx;
}

// pages/test1/test1.js
var app = getApp();
Page({
 /**
  * 页面的初始数据
  */
 data: {
  //判断小程序的API，回调，参数，组件等是否在当前版本可用。
  canIUse: wx.canIUse('button.open-type.getUserInfo'),
  isHide: false
 },
 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function (options) {
  var that = this;
  // 查看是否授权
  wx.getSetting({
   success: function (res) {
    if (!res.authSetting['scope.userInfo']) {
     // 还未授权，显示授权按钮
     that.setData({
      isHide: true
     });
    } else {
     // 已授权，隐藏授权按钮，显示正文
     that.setData({
      isHide: false
     });
    }
   }
  })
 },
 //授权登陆按钮
 bindGetUserInfo: function (e) {
  var that = this;
  console.log(e)
  if (e.detail.userInfo) {
   //用户授权登陆，并跳转首页
   // that.getOpenid()
   wx.login({
    success: function (res) {
     // 请求自己后台获取用户openid
     wx.request({
      url: app.domain + 'teacherapi/Wx_Decode/WxDecode',
      method: 'POST',
      header: { 'content-type': 'application/x-www-form-urlencoded' },
      data: {
       encryptedData: e.detail.encryptedData,
       signature: e.detail.signature,
       rawData: e.detail.rawData,
       iv: e.detail.iv,
       code: res.code
      },
      success: function (res_user) {
       if (res_user.data.status == 0) {
        var data = JSON.parse(res_user.data.msg)　　　　//json转对象
        //授权成功返回的数据，根据自己需求操作
        console.log(data)
        //授权成功后，隐藏授权按钮，显示正文
        that.setData({
         isHide: false
        });
       }
      }, fail: function () {
       that.showModal('获取授权信息失败')
      }
     })
    }
   })
  } else {
   //用户按了拒绝授权按钮，提示引导授权
   that.showModal('请授权后使用小程序')
  }
 },
 //未授权弹窗
 showModal: function (e) {
  wx.showModal({
   title: '提示',
   content: e,
   showCancel: false,
   confirmText: '返回授权',
   success: function (res) {
    if (res.confirm) {
     console.log('用户点击了“返回授权”')
    }
   }
  })
 },
})

<"authorization_code"; //授权（必填）
    $code = $data['code'];    //有效期5分钟 登录会话
    $encryptedData=$data['encryptedData'];
    $iv = $data['iv'];
    $signature = $data['signature'];
    $rawData = $data['rawData'];
    // 拼接url
    $url = "https://api.weixin.qq.com/sns/jscode2session"."appid=".$appid."&secret=".$appsecret."&js_code=".$code."&grant_type=".$grant_type;
    $res = json_decode($this->httpGet($url),true);
    $sessionKey = $res['session_key']; //取出json里对应的值
    $signature2 = sha1(htmlspecialchars_decode($rawData).$sessionKey);
    // 验证签名
    if ($signature2 !== $signature){
      return json("验签失败");
    } 
    // 获取解密后的数据
    $pc = new \WXBizDataCrypt($appid, $sessionKey);
    $errCode = $pc->decryptData($encryptedData, $iv, $data );
    if ($errCode == 0) {
      return return_succ($data);
    } else {
      return return_error($errCode);
    }
  }
}