uniapp如何设置动态样式

<view class="state-btn-content">
    <view @tap="selectState" data-state="over" :class="[whichSelected=='over'?'state-btn-selected':'state-btn-noselect']">已上线</view>
    <view @tap="selectState" data-state="pre" :class="[whichSelected=='pre'?'state-btn-selected':'state-btn-noselect']">未开始</view>
</view>
//选择状态
selectState(e){
    this.whichSelected=e.currentTarget.dataset.state
}
.state-btn-content{
    //write your style
    .state-btn-selected{ ... }
    .state-btn-noselect{ ... }
}

<view :class="['every-sign-item',`signstyle-${index%6}`]" v-for="(item,index) in preSignList" :key="index">{{item.name}}</view>
.every-sign-item{
padding: 4rpx 16rpx;
border-radius: 24rpx;
font-size: 24rpx;
margin-right: 20rpx;
margin-bottom: 20rpx;
}
.signstyle-0{
color: #3ac9e3;
border: 1px solid #3ac9e3;
}
.signstyle-1{
color: #fd8888;
border: 1px solid #fd8888;
}
.signstyle-2{ ... }
.signstyle-3{ ... }
.signstyle-4{ ... }
.signstyle-5{ ... }