1. `wx:if` ``` <view wx:if="{{condition==1}}"> 吃米饭 </view> <view wx:elif ="{{condition ==2}}"> 吃粥 </view> <view wx:else> 不吃 </view> ``` ``` Page({ data:{ condition : Math.floor(Math.random()*3+1) } }) ``` 2. 三元表达式 ``` <image bindtap = "click" src="{{show?'/images/tab/ciwei.png':'/images/tab/ciwei_hl.png'}}"/> ```