使用el-tabs 去修改样式的话比较麻烦，索性直接用div来制作。

<div class="contain">
    <div class="tab_wrap">
      <div :class="['skew', 'first', active == '1' ? 'isActive': '']" @click="tabClick(1)">
        <span class="tabs__name">需求列表</span>
      </div>
      <div :class="['skew', 'second',active == '2' ? 'isActive': '']" @click="tabClick(2)">
        <span class="tabs__name">测试任务</span>
      </div>
      <div :class="['skew', 'third',active == '3' ? 'isActive': '']" @click="tabClick(3)">
        <span class="tabs__name">缺陷查看</span>
      </div>
    </div>
  </div>

<script>
export default {
  data() {
    return {
      active: '1'
    }
  },
  methods: {
    tabClick(tab) {
      this.active = tab + ''
    }
  }
}
</script>

**

• css有点烂 轻喷，先凑合实现吧。重复的样式代码太多了，没做处理。如果有同学优化了的可以打在评论区哦

**

<style lang="scss">
.contain {
  width: 100%;
  height: 100%;
  padding: 24px;
}
.tab_wrap {
  display: flex;
  border-bottom: 1px solid #ccc;
}
.skew {
  position: relative;
  width: 120px;
  height: 40px;
}
.first::before {
  content: "";
  position: absolute;
  top: 0;
  right: 20px;
  width: 100px;
  height: 40px;
  border-radius: 10px 10px 0 0;
  background: #e0e8f6;
}
.first::after {
  content: "";
  position: absolute;
  top: 0;
  left: 6px;
  right: 0;
  bottom: 0;
  border-radius: 10px 10px 0 0;
  background: #e0e8f6;
  transform: skewX(15deg);
}
.first {
  &.isActive::before {
    content: "";
    position: absolute;
    top: 0;
    right: 20px;
    width: 100px;
    height: 40px;
    border-top: 1px solid #ccc;
    border-left: 1px solid #ccc;
    border-radius: 10px 0;
    background: #fff;
  }
  &.isActive::after {
    content: "";
    position: absolute;
    top: 0;
    left: 6px;
    right: 0;
    bottom: 0;
    border-top: 1px solid #ccc;
    border-radius: 10px 10px 0 0;
    background: #fff;
    transform: skewX(15deg);
  }
}

.second::before {
  content: "";
  position: absolute;
  top: 0;
  right: 13px;
  width: 100px;
  height: 40px;
  border-radius: 10px 10px 0 0;
  background: #e0e8f6;
}
.second::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 10px 10px 0 0;
  background: #e0e8f6;
  transform: skewX(15deg);
}
.second {
  &.isActive::before {
    content: "";
    position: absolute;
    top: 0;
    right: 30px;
    width: 100px;
    height: 40px;
    border-top: 1px solid #ccc;
    border-radius: 10px 10px 0 0;
    background: #fff !important;
    transform: skewX(-10deg);
  }
  &.isActive::after {
    content: "";
    position: absolute;
    top: 0;
    left: -4px;
    right: 0;
    bottom: 0;
    border-top: 1px solid #ccc;
    border-radius: 10px;
    background: #fff !important;
    transform: skewX(15deg);
  }
}

.third::before {
  content: "";
  position: absolute;
  top: 0;
  right: -13px;
  width: 100px;
  height: 40px;
  border-radius: 10px 10px 0 0;
  background: #a8c7fa;
}
.third::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 10px 10px 0 0;
  background: #a8c7fa;
  transform: skewX(15deg);
}
.third {
  &.isActive::before {
    content: "";
    position: absolute;
    top: 0;
    right: -13px;
    width: 100px;
    height: 40px;
    border-top: 1px solid #ccc;
    border-right: 1px solid #ccc;
    border-radius: 10px 10px 0 0;
    background: #fff;
  }
  &.isActive::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-top: 1px solid #ccc;
    border-radius: 10px 0 0 0;
    background: #fff;
    transform: skewX(15deg);
  }
}
.tabs__name {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  font-size: 14px;
}
</style>