杂谈一：前端设置绝对定位后滚动条失效的解决办法

<style>
	.fu{
  	background:url("https://xxx.png");
  	width:100%;
  	height:100vh;
  	background-size: 100% 100%;
	background-repeat: no-repeat;
	z-index: -999;
	position: fixed;
  	}
  .zi{
  	width:70%;
  	height:120vh;
  	background:red;
  }
</style>

<view class="fu">
  <scroll-view class="zi"></scroll-view>
</view>

<view class="fu"></view>
<scroll-view class="zi"></scroll-view>