1、搭配view
<view wx:if="{{boolean==true}}"> <view class="bg_black"></view></view><view wx:elif="{{boolean==false}}"> <view class="bg_red"></view></view><view wx:elif> <view class="bg_red"></view></view>
2、搭配block
<block wx:if="{{boolean==true}}"> <view class="bg_black"></view></block><block wx:elif="{{boolean==false}}"> <view class="bg_red"></view></block><block wx:else> <view class="bg_red"></view></block>
