小程序鼠标点击按钮（改变背景颜色字体）

<view class="iconusecont-div {{state==index?'active-tag':''}}" bindtap="select_use" wx:for="{{use}}" data-key='{{index}}'>
  <view class="flex-item">
    <rich-text class='use_name'>{{item.use_name}}</rich-text>
  </view>
</view>

/* 用途 */

.iconusecont-div {
  display: inline-block;
  width: 32%;
  text-align: center;
  margin-top: 30rpx;
}

.flex-item {
  display: inline-block;
  width: 173rpx;
  height: 78rpx;
  font-size: 26rpx;
  border: 2rpx solid #999;
  text-align: center;
  border-radius: 10rpx;
  color: #000;
  cursor: pointer;
  line-height: 30rpx;
}

.use_name {
  font-size: 34rpx;
  line-height: 79rpx;
}

.active-tag .flex-item {
  background: #03e2ff;
  color: #fff;
  border: 1rpx solid #fff;
}

Page({
  data: {
    use: [{
        "use_name": "全部"
      },
      {
        "use_name": "经济实惠型"
      },
      {
        "use_name": "家用学习型"
      },
      {
        "use_name": "豪华发烧型"
      },
      {
        "use_name": "疯狂游戏型"
      },
      {
        "use_name": "商务办公型"
      },
      {
        "use_name": "经济实惠型"
      },
      {
        "use_name": "家用学习型"
      },
    ],
    state: '',
  },
  //选择用途后加样式
  select_use: function(e) {
    this.setData({
      state: e.currentTarget.dataset.key,
    });
  },
  onReady: function() {},
})