微信小程序遍历循环中点击添加样式

.wxml中：

<view class="section">
<scroll-view id="sv" scroll-y style="width:150rpx;height:{{hei}}px;">
<block wx:for="{{leftMenu}}"wx:key="this">
<block wx:if="{{index == clickId}}">
<view bindtap="changeWhite" class="fff" id="{{index}}">
{{item}}
</view>
</block>
<blockwx:else>
<view bindtap="changeWhite" class="eee" id="{{index}}">
{{item}}
</view>
</block>
</block>
</scroll-view>
</view>