一个vue导航栏下划线跟随鼠标滑动的效果，纯 js + css

滑动效果

下划线会跟随这鼠标滑动，并且激活的item下划线会消失

最终代码

    <div class="cc">
      <div class="aa_box" ref="aa" @mouseleave="handleMouseLeave">
        <div
          class="aa_item"
          v-for="(i, index) in navList"
          :key="i"
          @click="aaBtn(index)"
          @mouseenter="handleMouseEnter(index)"
          :class="{ active: index == activeIndex || moveActiveIndex == index }"
        >
          {{ i }}
        </div>
      </div>
      <div class="aa-line" :style="{ left: handleX + 'px' }"></div>
    </div>

  data() {
    return {
      activeIndex: 0,
      moveActiveIndex: null,
      X: 0,
      current: 0,
      aa_x: 0,
      mouse_x: 0,
      isMove: false
    };
  },
  computed: {
    handleX() {
      return this.isMove ? this.mouse_x : this.aa_x;
    }
  },
  methods: {
    aaBtn(index) {
      this.activeIndex = index;
      this.aa_x = this.handleMouver(index);
    },
    handleMouseEnter(index) {
      this.isMove = true;
      this.moveActiveIndex = index;
      this.mouse_x = this.handleMouver(index);
    },
    handleMouseLeave() {
      this.isMove = false;
      this.mouse_x = 0;
      this.moveActiveIndex = null;
    },
    handleMouver(index) {
      const aa = this.$refs["aa"].children;
      let num = 0;
      for (let i = 0; i < aa.length; i++) {
        const item = aa[i];
        if (i + 1 <= index) {
          const itemWidth = item.clientWidth + 50;
          num += itemWidth;
        }
      }
      return num;
    }
  },

最后

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