微信小程序遍历循环中点击添加样式

.wxml中：

<viewclass='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>

.js中

data: {

clickId:0,

},

changeWhite:function(res){

var cla = res.currentTarget.id;

console.log(res.currentTarget.id);

this.setData({

clickId:cla

})

},