<template>
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<div class="page-main" @scroll="throttledScrollHandler">
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<div class="page-content">
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<pageHeader v-if="showCatalogList.indexOf(0) > -1"></pageHeader>
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<chapterOne v-if="showCatalogList.indexOf(1) > -1"></chapterOne>
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<chapterOne v-if="showCatalogList.indexOf(1) > -1"></chapterOne>
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<chapterTwo v-if="showCatalogList.indexOf(2) > -1"></chapterTwo>
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<chapterThree v-if="showCatalogList.indexOf(3) > -1"></chapterThree>
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<chapterFour v-if="showCatalogList.indexOf(4) > -1"></chapterFour>
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<chapterFive v-if="showCatalogList.indexOf(5) > -1"></chapterFive>
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<chapterSix v-if="showCatalogList.indexOf(6) > -1"></chapterSix>
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<chapterSeven v-if="showCatalogList.indexOf(7) > -1"></chapterSeven>
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<chapterEight v-if="showCatalogList.indexOf(8) > -1"></chapterEight>
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<chapterNine v-if="showCatalogList.indexOf(9) > -1"></chapterNine>
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<chapterTen v-if="showCatalogList.indexOf(10) > -1"></chapterTen>
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<chapterEleven v-if="showCatalogList.indexOf(11) > -1"></chapterEleven>
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<chapterTwelve v-if="showCatalogList.indexOf(12) > -1"></chapterTwelve>
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<chapterThirteen
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v-if="showCatalogList.indexOf(13) > -1"
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></chapterThirteen>
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</div>
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</div>
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</template>
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<script>
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import pageHeader from "./components/header.vue";
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import chapterOne from "./components/chapter001.vue";
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import chapterTwo from "./components/chapter002.vue";
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import chapterThree from "./components/chapter003.vue";
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import chapterFour from "./components/chapter0004.vue";
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import chapterFive from "./components/chapter005.vue";
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import chapterSix from "./components/chapter006.vue";
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import chapterSeven from "./components/chapter007.vue";
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import chapterEight from "./components/chapter008.vue";
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import chapterNine from "./components/chapter009.vue";
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import chapterTen from "./components/chapter010.vue";
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import chapterEleven from "./components/chapter011.vue";
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import chapterTwelve from "./components/chapter012.vue";
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import chapterThirteen from "./components/chapter013.vue";
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import _ from "lodash";
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export default {
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data() {
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return {
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catalogLength: 13, // 总章节数
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showCatalogList: [], // 显示的章节
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loadThreshold: 300, // 触发加载阈值
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throttleThreshold: 100, // 节流阈值
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previousScrollTop: 0,
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throttledScrollHandler: null
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};
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},
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mounted() {
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// 默认加载章节
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this.showCatalogList = [0];
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// 滚动监听节流
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this.throttledScrollHandler = _.throttle(
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this.scrollFun,
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this.throttleThreshold,
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{ leading: true, trailing: false }
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);
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// 提供页面跳转功能
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if (this.setGlobalState) {
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this.setGlobalState({
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gotoPage: (catalog, page) => {
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this.gotoPage(catalog, page);
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}
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});
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}
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// 测试页面跳转
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// setTimeout(() => {
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// this.gotoPage(5, 100);
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// }, 3000);
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},
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methods: {
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scrollFun(e) {
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// 判断向上滚动还是向下滚动
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if (event.target.scrollTop > this.previousScrollTop) {
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const currentScrollTop =
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event.target.scrollTop + event.target.offsetHeight;
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if (
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currentScrollTop >=
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event.target.scrollHeight - this.loadThreshold
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) {
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// 到达阈值
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if (
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this.showCatalogList[this.showCatalogList.length - 1] <
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this.catalogLength
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) {
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// 加载下一章
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this.showCatalogList.push(
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this.showCatalogList[this.showCatalogList.length - 1] + 1
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);
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if (this.showCatalogList.length > 3) {
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// 超过三章隐藏顶部一章
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this.showCatalogList.shift();
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}
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}
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}
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} else if (event.target.scrollTop < this.previousScrollTop) {
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const currentScrollTop = event.target.scrollTop;
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if (currentScrollTop <= this.loadThreshold) {
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// 到达阈值
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if (this.showCatalogList[0] > 0) {
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// 加载上一章
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this.showCatalogList.unshift(this.showCatalogList[0] - 1);
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if (this.showCatalogList.length > 3) {
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// 超过三章隐藏底部一章
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this.showCatalogList.pop();
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}
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}
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}
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}
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console.log(this.showCatalogList);
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// 更新上一次滚动的位置
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this.previousScrollTop = event.target.scrollTop;
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},
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gotoPage(catalog, page) {
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if (catalog >= 0 && catalog <= this.catalogLength) {
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// 处理渲染章节
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if (catalog == 0) {
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this.showCatalogList = [0, 1];
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} else if (catalog == this.catalogLength) {
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this.showCatalogList = [
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this.catalogLength - 2,
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this.catalogLength - 1,
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this.catalogLength
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];
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} else {
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this.showCatalogList = [catalog - 1, catalog, catalog + 1];
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}
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setTimeout(() => {
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// 跳转页码
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const pageDom = document.querySelector(`[page="${page}"]`);
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if (pageDom) {
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pageDom.scrollIntoView();
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} else {
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console.log("页码错误！");
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}
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}, 50);
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} else {
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console.log("章节错误！");
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}
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}
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},
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components: {
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pageHeader,
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chapterOne,
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chapterTwo,
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chapterThree,
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chapterFour,
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chapterFive,
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chapterSix,
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chapterSeven,
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chapterEight,
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chapterNine,
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chapterTen,
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chapterEleven,
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chapterTwelve,
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chapterThirteen
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}
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};
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</script>
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<style lang="less" scoped>
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.page-main {
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width: 100%;
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height: 100%;
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overflow: auto;
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.page-content {
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max-width: 816px;
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min-width: 375px;
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margin: 0 auto;
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padding-bottom: 100px;
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}
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}
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</style>
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