微信小程序----导航栏透明渐变一（MUI导航栏透明渐变）

<!--pages/scroll/scroll.wxml-->
<view style="height:100%;position:fixed;width:100%;">
  <scroll-view scroll-y="false"  bindscroll="scroll" style="height:100%;">
    <view class="page-group">
      <view class="page-group-position" style="opacity:{{scrollTop / 400 > 0.9 ? 0.9 : scrollTop / 400}}"></view>
      <view class="page-nav-list"><text>首页</text></view>
      <view class="page-nav-list"><text>活动</text></view>
      <view class="page-nav-list"><text>菜单</text></view>
      <view class="page-nav-list"><text>我的</text></view>
    </view>
    <view class="page-banner">
      banner
    </view>
    <view class="goods-list">
      goods-list1
    </view>
    <view class="goods-list list2">
      goods-list2
    </view>
    <view class="goods-list list3">
      goods-list3
    </view>
    <view class="goods-list list4">
      goods-list4
    </view>
  </scroll-view>
</view>

.page-banner{height: 500rpx;background-color: greenyellow;padding: 20rpx;color:#fff;padding-top: 100rpx;}
.page-group{
  display: table;
  width: 100%;
  table-layout: fixed;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
}
.page-group-position{
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: blueviolet;
  opacity: 0;
  z-index: -1;
}
.page-nav-list{
  padding:30rpx 0 ;
  display: table-cell;
  text-align: center;
  width: 100%;
  color: #fff;
}
.goods-list{
  height: 500rpx;
  background-color: green;
  padding: 20rpx;
  color:#fff;
}
.list2{background-color: blue;}
.list3{background-color: yellow;}
.list4{background-color: red;}

Page({
  data: {
    scrollTop: null
  },
  //滚动条监听
  scroll: function (e) {
    this.setData({ scrollTop: e.detail.scrollTop })
  },
})