`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) } }) ~~~ demo 1.使用点击事件,实现图片切换 ~~~ <image bindtap = "click" wx:if="{{show}}" src="/images/tab/ciwei.png"/> <image bindtap = "click" wx:else src="/images/tab/ciwei_hl.png"/> ~~~ ~~~ //js Page({ data: { show:false }, click(){ if(this.data.show){ this.setData({ show:false }) }else{ this.setData({ show:true }) } } }) ~~~ 2.使用三元表达式 ~~~ <image bindtap = "click" src="{{show?'/images/tab/ciwei.png':'/images/tab/ciwei_hl.png'}}"/> ~~~