微信小程序原生自定义弹窗

背景

微信小程序原生的在弹出层wx.showModal中可以通过配置项editable配置输入框，但是对于微信的版本有限制，微信版本过低无法显示，所以需要实现弹出层的效果
如下图

代码

index.wxml

<!-- 遮罩层 -->
  <view wx:if="{{isShow}}" class='cover'>
    <!-- 可在此按需求自定义遮罩 -->
    <view style="position: relative;">
      <view class='cover_child'>
        <text class="child-title">请输入距离（km）</text>
        <input class="weui-input" type="number" bindinput="bindKeyInput" placeholder="请输入1-80之间的整数" />
      </view>
      <view class='btn-group'>
        <view catchtap="hideCover">取消</view>
        <view style="color: #5A6B8F;">确认</view></view>
    </view>
  </view>

index.js

Page({
  data: {
    inputDisValue:'',
    }
    })
    //实时获取到输入的值
  bindKeyInput(e) {
    console.log(e.detail.value)
    this.setData({
      inputDisValue: e.detail.value
    })
  },

  hideCover(){
    this.setData({
      isShow: false
    })
  },
  showCover(){
    this.setData({
      isShow:true
    })
  },

index.wxss

.bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  padding: 0 20rpx;
}

.btn-group {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  display: flex;
  justify-content: space-around;
  font-weight: bold;
  padding: 20rpx 0;
}

.weui-input {
  background-color: #f1f1f1;
  border-radius: 10rpx;
  width: 400rpx;
  padding: 16rpx 16rpx;
}

.cover {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 999;
}

.cover_child {
  width: 550rpx;
  height: 300rpx;
  background: rgba(255, 255, 255, 1);
  border-radius: 20rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 5;
}

.child-title {
  white-space: nowrap;
  margin-top: 60rpx;
  height: 32rpx;
  font-size: 34rpx;
  font-weight: bold;
  color: #333333;
  line-height: 36rpx;
  margin-bottom: 31rpx;
}

.cross {
  margin-bottom: 110rpx;
  bottom: 0rpx;
  position: fixed;
  width: 60rpx;
  height: 60rpx;
  z-index: 5;
}