微信小程序 实现点击添加移除class

微信小程序点击添加移除class类实现动态变化class

wxml：

<view class="location_bottom" hidden="" >
   <view class="{{_num == 1?'add_citying':'add_city'}}" data-num = "1" bindtap="clickNum">北京</view>
   <view class="{{_num == 2?'add_citying':'add_city'}}" data-num = "2" bindtap="clickNum">上海</view>
 </view>

wxss:

.location_bottom{height: 140rpx;line-height: 140rpx;color: #d91f16;font-size:
 28rpx;border-top: 2rpx #ebebeb solid; border-bottom: 2rpx #ebebeb solid; padding: 0 20rpx; align-items: center;display: -webkit-flex;}

.add_city{width: 228rpx;height: 60rpx;line-height: 60rpx; text-align: center; border: 2rpx
solid #ebebeb; color: #000000;margin-right: 20rpx; }
.add_citying{width: 228rpx;height: 60rpx;line-height: 60rpx; text-align: center;
 border: 2rpx solid #09bb07; color: #09bb07;margin-right: 20rpx;}

js:

Page({
 data: {
  _num: 0,
 },
 clickNum: function (e) {
  console.log(e.target.dataset.num)
  this.setData({
   _num: e.target.dataset.num
  })
 },
 onLoad: function (options) {

 }


})

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