<view class="view" style="color:{{color}}">我是view标签</view>
<view style="display:flex;">  
  <block wx:for="{{colorArray}}" wx:key="" wx:for-item="Color">
    <button class="btn" style="background:{{Color}};" type="default" bindtap="bindtap{{index}}"></button>
  </block>
</view>

var pageData={}
pageData.data={
  color:'black',
  colorArray:['red','blue','yellow','green','black']
}
for(var i=0;i<5;++i){
  (function(index){
    pageData['bindtap'+index]=function(e){
      this.setData({
        color:this.data.colorArray[index]
      })
    }
  })(i)
}
Page(pageData)