<view wx:if="{{true}}">显示</view>
<view wx:if="{{false}}">隐藏</view>
<view>----------------------</view>
<view wx:if="{{false}}">1</view>
<view wx:elif="{{false}}">2</view>
<view wx:else>3</view>
<view>----------------------</view>
<view hidden>hellow</hidden>
<view hidden="{{false}}">hellow</hidden>
wx:if 和hidden