vue使用原生js实现滚动页面跟踪导航高亮

需要使用vue做一个专题页面。

滚动页面指定区域导航高亮。

我使用的方法是在定位元素上添加id，在导航添加data-id属性，监听滚动事件，如果当前滚动区域大于定位元素区域，将元素的id赋值给变量，然后与导航的data-id进行匹配，切换class。

html结构

main.vue

<template>
  <div class="qz-home">
    <div class="quiz-container">
      <div class="quiz-ad-pic" id="pagetop"></div>
      <div class="quiz-main">
        <div class="quiz-main-inside" id="js-content">
          <quiz-sessions class="item" id="quizhall"></quiz-sessions>
          <quizRecords class="item" id="quizrecord"></quizRecords>
          <quiz-history class="item" id="quizHistory"></quiz-history>
          <quiz-mine class="item" id="quizMine"></quiz-mine>
          <quiz-rank class="item" id="quizRank"></quiz-rank>
          <quiz-rule class="item" id="quizRule"></quiz-rule>
        </div>
      </div>
      <navigation id="js-nav"></navigation>
    </div>
  </div>
</template>

navigation.vue

<template>
  <nav class="nav-container">
    <div class="nav-mark"></div>
    <div class="nav-main">
      <ul class="nav-list">
        <li :class="{'cur': curindex === index}" v-for="(item, index) in navList" :key="index" :data-id="item.id"><a @click="linkTo(item.id, index)">{{item.name}}</a></li>
      </ul>
      <div class="backtop" @click="backTop()">
        <a></a>
      </div>
    </div>
  </nav>
</template>

javascript

export default {
  name: "Navigation",
  data() {
    return {
      navList: [
        { name: "竞猜大厅", id: "quizhall" },
        { name: "竞猜记录", id: "quizrecord" },
        { name: "历史赛事", id: "quizHistory" },
        { name: "我的竞猜", id: "quizMine" },
        { name: "排行榜", id: "quizRank" },
        { name: "玩法", id: "quizRule" }
      ],
      curindex: 0
    };
  },
  mounted() {
    this.initScroll();
  },
  methods: {
    initScroll() {
      let _this = this;
      // 监听页面滚动事件
      window.addEventListener('scroll', function() {
        var removeClass = function(obj, cls) {
          if (obj.className == cls) {
            obj.className = "";
          }
        }
        var addClass = function(obj, cls) {
          if (obj.className != cls) {
            obj.className = cls;
          }
        }

        let pos = document.documentElement.scrollTop;
        if (pos > 300) {
          _this.isVisibleNav = true;
        } else {
          _this.isVisibleNav = false;
        }
        // 获取全部导航dom与元素dom
        var navList = document.querySelector("#js-nav").querySelectorAll("li");
        var items = document.querySelector("#js-content").querySelectorAll(".item");
        // 滚动后遍历元素，如果页面滚动位置大于元素的位置，赋值给变量
        var currentId = "";
        for (var i = 0; i < items.length; i++) {
          var _item = items[i];
          var _itemTop = _item.offsetTop;
          if (pos > _itemTop - 200) {
            currentId = _item.id;
          } else {
            break;
          }
        }
        // 如果已赋值了变量，进行匹配，如果匹配则添加class其他删除
        if (currentId) {
          for (var j = 0; j < navList.length; j++) {
            var _navItem = navList[j];
            var _navId = _navItem.getAttribute('data-id');
            if (_navId != currentId) {
              removeClass(_navItem, "cur");
            } else {
              addClass(_navItem, "cur");
            }
          }
        }
      })
    }
  }
};

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