Vue点击选中（多选）选中右上角有三角形_vue的table给选择按钮加角标

参考1：https://blog.csdn.net/Just_Maybe/article/details/103597060
参考2：画三角形：https://blog.csdn.net/ka_xingl/article/details/117251528

获取最后一个元素：&:last-child {}

div{
  margin-right: 10px;
  &:last-child{
   margin-right: 0px;
  }
}
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原理：

 <div class="select-box">
    <div class="box">
      <div>全部</div>
      <div class="box-con">
        <span>×</span>
      </div>
    </div>

    <div class="box">
      <div>水污染</div>
      <div class="box-con">
        <span>×</span>
      </div>
    </div>

    <div class="box">
      <div>大气污染</div>
      <div class="box-con">
        <span>×</span>
      </div>
    </div>

    <div class="box">
      <div>土壤污染</div>
      <div class="box-con">
        <span>×</span>
      </div>
    </div>
  </div>
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.select-box {
  display: flex;

  .box {
    width: 86px;
    height: 36px;
    line-height: 36px;
    background: rgba(30, 37, 48, 0.6);
    border: 1px solid #67e5ff;
    border-radius: 4px;
    font-size: 14px;
    color: #67e5ff;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .box:nth-child(-n + 3) {
    margin-right: 16px;
  }

  .box .box-con {
    width: 30px;
    height: 30px;
    position: absolute;
    background: #67e5ff;
    top: -15px;
    right: -15px;
    transform: rotate(45deg);
  }

  .box .box-con span {
    position: absolute;
    bottom: 0;
    display: block;
    width: 24px;
    height: 24px;
    text-align: center;
    transform: rotate(-45deg);
    color: #000;
  }
}
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实现点击切换：

方法一：
实现原理：利用三元表达式来添加不同类名、控制显示隐藏、display:none

<template>
  <div class="select-box">
    <div :class="item.selected === true ? 'box active' : 'box'" v-for="(item, index) in tabList" :key="index" @click="changePollutionType(item, $event)">
      <div>{{ item.label }}</div>
      <div :class="item.selected === true ? 'box-con' : 'con-none'">
        <span>×</span>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: '',
  data() {
    return {
      tabList: [
        { label: '全部', value: '全部', selected: false },
        { label: '水污染', value: '水污染', selected: false },
        { label: '大气污染', value: '大气污染', selected: false },
        { label: '土壤污染', value: '土壤污染', selected: false },
      ],
    }
  },
  methods: {
    changePollutionType(item, e) {
      if (item.selected === true) {
        item.selected = false
      } else {
        item.selected = true
      }
    },
  },
}
</script>

<style lang="scss" scoped>
.select-box {
  display: flex;

  .box {
    width: 86px;
    height: 36px;
    line-height: 36px;
    background: rgba(30, 37, 48, 0.6);
    border: 1px solid #67e5ff;
    border-radius: 4px;
    font-size: 14px;
    color: #67e5ff;
    text-align: center;
    position: relative;
    overflow: hidden;
    cursor: pointer;

    &.active {
      background: rgba(6, 44, 103, 0.6);
    }
  }

  .box:nth-child(-n + 3) {
    margin-right: 16px;
  }

  .con-none {
    display: none;
  }

  .box .box-con {
    width: 30px;
    height: 30px;
    position: absolute;
    background: #67e5ff;
    top: -15px;
    right: -15px;
    transform: rotate(45deg);
  }

  .box .box-con span {
    position: absolute;
    bottom: 0;
    display: block;
    width: 24px;
    height: 24px;
    text-align: center;
    transform: rotate(-45deg);
    color: #000;
  }
}

.icon-duigou:before {
  content: '\E606';
  font-size: 4px;
}
</style>
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实现方法二：
实现原理：利用伪类、js中动态添加类名

<template>
  <div class="tab-list-box">
    <div class="tab-list" v-for="(item, index) in tabList" :key="index" @click="changePollutionType(item, $event)">
      <div class="tab-item">{{ item.label }}</div>
    </div>
  </div>
</template>

<script>
export default {
  name: '',
  data() {
    return {
      tabList: [
        { label: '全部', value: '全部', selected: false },
        { label: '水污染', value: '水污染', selected: false },
        { label: '大气污染', value: '大气污染', selected: false },
        { label: '土壤污染', value: '土壤污染', selected: false },
      ],
    }
  },
  methods: {
    changePollutionType(item, e) {
      if (item.selected === true) {
        item.selected = false
      } else {
        item.selected = true
      }

      if (e.target.className === 'tab-item') {
        e.target.className = 'tab-item active' //切换按钮
      } else {
        e.target.className = 'tab-item' //切换按钮
      }
    },
  },
}
</script>

<style lang="scss" scoped>
.tab-list-box {
  margin-top: 20px;

  .tab-list {
    display: inline-block;

    .tab-item {
      width: 86px;
      height: 36px;
      background: rgba(30, 37, 48, 0.6);
      border: 1px solid #67e5ff;
      opacity: 1;
      border-radius: 4px;
      text-align: center;
      line-height: 36px;
      cursor: pointer;
      position: relative;
      &.active {
        background: rgba(6, 44, 103, 0.6);
      }

      &.active::before {
        content: '';
        width: 0;
        height: 0;
        border: 15px solid transparent;
        border-right: 15px solid #67e5ff;
        transform: rotate(135deg);
        position: absolute;
        right: -15px;
        top: -16px;
        cursor: pointer;
      }

      &.active::after {
        content: 'x';
        width: 16px;
        height: 16px;
        color: #fff;
        position: absolute;
        right: 0px;
        top: -11px;
        cursor: pointer;
      }
    }
  }

  .tab-list:nth-child(-n + 3) {
    margin-right: 16px;
  }
}
</style>
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---

额外补充：右上角的删除符号
参考：https://juejin.cn/post/6844904001750695943
效果：