微信小程序登录按钮遮罩浮层效果的实现方法

<!-- 授权弹框提示 -->
 <view class="container">
 <view class="float" hidden='{{viewShowed}}'>
 <view class='floatContent'>
  <view class='floatText'>
  <text>获取微信授权信息</text>
  <button open-type="getUserInfo" bindgetuserinfo="getUserInfo">去设置</button>
  </view>
 </view>
 </view>
</view>

.float {
 height: 100%;
 width: 100%;
 position: fixed;
 background-color: rgba(0, 0, 0, 0.5);
 z-index: 2;
 top: 0;
 left: 0;
}

.floatContent {
 padding: 20rpx 0;
 width: 80%;
 background: #fff;
 margin: 40% auto;
 border-radius: 20rpx;
 display: flex;
 flex-direction: column;
 justify-content: space-around;
 align-items: center;
 position: relative;
 height: 332rpx;
}

.floatText text {
 color: #000;
 font-size: 40rpx;
 display: block;
 text-align: center;
 line-height: 90rpx;
 border-radius: 30rpx;
 margin-right: 10rpx;
}

//index.js
//获取应用实例

var app = getApp()

Page({
 data: {
 carList: [], //车辆数据集合
 viewShowed: true, //控制授权是否显示

 },

 onLoad: function () {
 var that = this;
 

 app.getOpenid().then(function (res) {
  if (res.status == 200) {
  //判断是否授权
  wx.getSetting({
   success(e) {
   if (e.authSetting['scope.userInfo']) { //已经授权
    that.getCars(res.data);
   } else { //没有授权，显示授权框
    that.setData({
    viewShowed: false,
    })
   }
   }
  })
  }
 })
 },

 getUserInfo: function (e) {
 var that = this;
 that.setData({
  viewShowed: true,
 });
 var userinfo = e.detail.userInfo;
 wx.request({
  url: "http://localhost:8081/wpDeboServer/wx.do",
  data: {
  "openid": app.globalData.openid,
  "nickname": userinfo.nickName
  },
  method: 'PUT',
  header: {
  'Content-type': 'application/json'
  },
  success: function (res) {
  //查询绑定车辆
  that.getCars(app.globalData.openid);
  }
 });
 },
})