Vue分页器实现原理详解

<template>
 <div v-if="news">
 <div v-for="(item, index) in newList" v-if="(index <= (newListPageIndex * 4)-1) && (index >= (newListPageIndex-1) * 4)" class="new-show-left">
 <div class="new-img">
  <img :src="item.img" alt=""/>
 </div>
 <div class="time">
  <span>{{item.time}}</span>
 </div>
 <h1>{{item.title}}</h1>
 <p>{{item.content}}</p>
 </div>
 </div>
</template>
<script type="text/ecmascript-6">
 import page from '@/components/page'
 import bus from '@/eventBus/eventBus'
 import {getNew} from '@/getData/getData'
 export default{
 components: {
 page
 },
 data () {
 return {
 newList: '',
 newList2: '',
 newListLength: '',
 newListPageIndex: '1', // 下标
 next: false,
 previous: false,
 news: true,
 title: ''
 }
 },
 created () {
 this.$nextTick(() => {
 this._init_list1()
 })
 bus.$on('current-item', (ev) => {
 this.$nextTick(() => {
  this.currentItem(ev)
 })
 })
 bus.$on('next-page', (ev) => {
 this.$nextTick(() => {
  this.nextPage(ev)
 })
 })
 bus.$on('previous-page', (ev) => {
 this.$nextTick(() => {
  this.previousPage(ev)
 })
 })
 },
 methods: {
 _init_list1 () {
 getNew().then(res => {
  this.newList = res.data.list1
  let myObject = res.data.list1
  this.newListLength = Object.keys(myObject).length
  this.newListLength = Math.ceil((this.newListLength) / 6)
  this.pageStyle()
 })
 },
 pageStyle () {
 if (this.newListPageIndex < this.newListLength) {
  this.next = true
  if (this.newListPageIndex > 1) {
  this.previous = true
  } else {
  this.previous = false
  }
 } else {
  this.next = false
  if (this.newListPageIndex > 1) {
  this.previous = true
  } else {
  this.previous = false
  }
 }
 },
 currentItem (ev) {
 this.newListPageIndex = ev
 window.scrollTo(0, 500)
 this.pageStyle()
 },
 nextPage () {
 if (this.newListPageIndex < this.newListLength) {
  this.newListPageIndex ++
  window.scrollTo(0, 500)
  this.pageStyle()
 }
 },
 previousPage () {
 if (this.newListPageIndex > 1) {
  this.newListPageIndex --
  window.scrollTo(0, 500)
  this.pageStyle()
 }
 }
 }
 }
</script>

<template>
 <ul class="page">
 <li>
  <img @click="previousPage" :src="[(previous==true ? 'static/images/leftGo-black.png' : 'static/images/leftGo.png')]">
  <span @click="previousPage" :class="[(previous==true ? 'black-color' : 'gray-color')]">上一页</span>
 </li>
 <li >
  <span @click="currentItem" v-for="(item, index) in listLength" :class="[(listPageIndex == index+1) ? 'gray-color':'black-color']">{{item}}</span>
 </li>
 <li>
  <span @click="nextPage" :class="[(next == true ? 'black-color':'gray-color')]">下一页</span>
  <img @click="nextPage" :src="[(next==true ? 'static/images/rightGo.png' : 'static/images/rightGo-gray.png')]">
 </li>
 </ul>
</template>

<script type="text/ecmascript-6">
 import bus from '@/eventBus/eventBus'
 export default{
 props: {
 listLength: '',
 listPageIndex: '',
 next: '',
 previous: ''
 },
 created () {
// console.log(this.next)
 },
 methods: {
 currentItem (ev) {
 bus.$emit('current-item', ev.target.innerHTML)
 },
 nextPage (ev) {
 bus.$emit('next-page', ev)
 },
 previousPage (ev) {
 bus.$emit('previous-page', ev)
 }
 }
 }
</script>

{
 "id": "1",
 "title": "新闻一",
 "time": "2017.10",
 "content": "新闻一的简介...",
 "imgSrc": "static/images/new1.png"
},
{
 "id": "2",
 "title": "新闻二",
 "time": "2017.11",
 "content": "新闻二的简介...",
 "imgSrc": "static/images/new2.png"
},
...（总归六条数据省略四条不写）

this.newListLength = Math.ceil((this.newListLength) /4)

<div v-for="(item, index) in newList" v-if="(index <= (newListPageIndex * 4)-1) && (index >= (newListPageIndex-1) * 4)">

if (this.newListPageIndex < this.newListLength) {
  this.newListPageIndex ++
 }
if (this.equipmentListPageIndex > 1) {
  this.newListPageIndex --
 }

v-for="(item, index) in newListLength" :key="index" :class="[(newListPageIndex == index+1) ? 'gray-color':'black-color']"