微信小程序仿RadioGroup改变样式的处理方案

<view bindchange="radioChange">
<view class='list_item' wx:for="{{radioValues}}" data-index="{{index}}" bindtap='radioChange' style="{{index == radioValues.length-1">
<text style='color:rgb(96,96,96)'>{{item.value}}</text>
<view wx:if="{{item.selected}}" class='item'>
<view style='width:20rpx;height:20rpx;background-color:rgb(144,144,144);border-radius:100%;'></view>
</view> 
<view wx:else class='item'></view> 
</view>
</view>

.list_item{
display: flex;
justify-content: space-between;
align-items: center;
margin:0 25rpx;
width:700rpx;
font-size: 30rpx;
color: rgb(79,79,79);
padding: 28rpx 0;
border-bottom:1px solid rgb(209,209,209); 
}
.item{
width: 28rpx;
height: 28rpx;
border: 2px solid rgb(144,144,144);
border-radius: 100%;
display: flex;
align-items: center;
justify-content: center;
}

Page({
 data: {
 radioValues: [
{ 'value': '未付款订单', 'selected': false },
{ 'value': '进行中的订单', 'selected': false },
{ 'value': '完成了的订单', 'selected': false },
{ 'value': '所有订单', 'selected': true },
]
},
 onLoad: function (options) {
},
 radioChange:function(e){
var index = e.currentTarget.dataset.index;
var arr = this.data.radioValues;
for (var v in arr){
if (v == index){
 arr[v].selected = true;
}else{
 arr[v].selected = false;
}
}
this.setData({
 radioValues:arr
})
}
})