## tabs 手写版

第一部分

    <template>
    <!-- 搜索框 -->
    <YgSearch/>
    <!-- tabs 标签页 -->
    <u-tabs :list="tabsList" :current="current" :is-scroll="false" @change="changeTab"/>
    <!-- <u-tabs :list="tabsList" :current="current" :is-scroll="false" @change="changeTab"/> -->
    <Tabs/>
  </view>
</template>

<script>
import Tabs from "./components/tabs.vue";
export default {
  components: { Tabs },
  data() {
    return {
      tabsList: [],
    };
  },
};

第2部分

<template>
<view class="list">
    <view class="item"
      :class="{active: index === current}"
      v-for="(item, index) in list"
      :key="index"
      @click="changeTab(index)"
    >
      {{item}}
    </view>
    <view class="underline" :class="{
      left: current === 0,
      middle: current === 1,
      right: current === 2
    }"></view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      current: 0,
      list: ['综合', '销量', '价格']
    }
  },
  methods: {
    changeTab(index) {
      console.log(index);
      this.current = index
    }
  }
}
</script>

<style lang="scss" scoped>
.list {
  display: flex;
  position: relative;
  .item {
    width: 33.33%;
    text-align: center;
    font-size: 30rpx;
    line-height: 88rpx;
    color: #676767;
  }
  .active {
    color: #eb4450;
    font-weight: bold;
  }
  .underline {
    width: 25.33%;
    margin: 0 4%;
    height: 6rpx;
    background-color: #eb4450;
    position: absolute;
    bottom: 0;
    left: 0;
    transition: all 0.5s;
    &.middle {
      left: 33.33%;
    }
    &.right {
      left: 66.66%;
    }
  }
}