vue使用原生js实现滚动页面跟踪导航高亮

<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>

<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>

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");
 }
 }
 }
 })
 }
 }
};