vue 导航锚点_点击平滑滚动,导航栏对应变化详解

<div class="all-title">
    全部应用
    <p class="fr">
     <span v-for="(item, index) in allMenuList" :key="item.id" :class="[index===activeMenu?'active':'']" @click="jump(index)">{{ item.name }}</span>
    </p>
   </div>
   <div id="scrollBox" class="applications-content">
    <div v-for="(val, index) in allMenuList" :key="val.id" class="all-list do-jump">
     <p class="applications-title">{{ val.name }}</p>
     <ul class="applications-list">
      <li v-for="item in val.children" :key="item.id" class="applications-item" @click="changeRouterForRight(item.pathName,item.menuCode)">
       <img src="">
       <span>{{ item.name }}</span>
       <template v-if="showEdit">
        <i v-if="addOrRemove(item.menuCode)==0" class="el-icon-circle-plus add-btn" @click="addMenu(item.menuCode)" />
        <i v-if="addOrRemove(item.menuCode)==1" class="el-icon-remove remove-btn" @click="removeMenu(item.menuCode)" />
       </template>
      </li>
     </ul>
    </div>
   </div>

// 跳转
  jump(index) {
   this.activeMenu = index // 当前导航
   const jump = jQuery('.do-jump').eq(index)
   const scrollTop = jump.position().top + this.scrollBox.scrollTop // 获取需要滚动的距离
   // Chrome
   this.scrollBox.scrollTo({
    top: scrollTop,
    behavior: 'smooth' // 平滑滚动
   })
  }

// 获取滚动dom元素
  this.scrollBox = document.getElementById('scrollBox')
  const jump = jQuery('.do-jump')
  const topArr = []
  for (let i = 0; i < jump.length; i++) {
   topArr.push(jump.eq(i).position().top)
  }
  // 监听dom元素的scroll事件
  this.scrollBox.addEventListener('scroll', () => {
   const current_offset_top = that.scrollBox.scrollTop
   for (let i = 0; i < topArr.length; i++) {
    if (current_offset_top <= topArr[i]) { // 根据滚动距离判断应该滚动到第几个导航的位置
     that.activeMenu = i
     break
    }
   }
  }, true)