<div id="app" v-cloak @click="showOption=false">
 第{{pageIndex}}頁(yè), 每頁(yè)顯示{{pageSize}}條
 <div v-show="pageTotalNum > 1" class="pageContainer">
  共{{dataListLength}}條
 <ul class="pagesInner">
  <li class="page" @click="prevOrNext(-1)"><span aria-hidden="true">&lt;</span></li>
  <li class="page" v-for="(item, index) in pages" :key="index" :class="{actived: item == pageIndex}" @click="selectPage(item)">
  <span>{{item}}</span>
  </li>
  <li class="page" @click="prevOrNext(1)"><span class="fa fa-chevron-right" aria-hidden="true">&gt;</span></li>
 </ul>
 <div class="page-size-box">
  <span @click.stop="showOption=!showOption">{{pageSize}}條/頁(yè)</span>
  <ul class="size-option" v-show="showOption">
  <li v-for="(item, index) in pageSizeList" :key="index" @click="pageSize=item;showOption=false">{{item}}條/頁(yè)</li>
  </ul>
 </div>
 跳至&nbsp;
  <form id="frm1">
   <input type="text" v-model="goToPage" style="text-align: center;">
  </form>
 &nbsp;頁(yè)&nbsp;
 button @click="handleGoToPage">確定</button>
 </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script> 	<!--兼容IE -->
<script>
 var app = new Vue({
 el: "#app",
 data: {
  pageIndex: 1,
  goToPage: '',
  // pageTotalNum: 16,
  dataListLength:147,
  pageSize:20,
  pageSizeList:[20,30,50,100],
  showOption:false
 },
 methods: {
  prevOrNext: function(n) {
  this.pageIndex += n
  this.pageIndex <= 1 ? this.pageIndex = 1 : this.pageIndex > this.pageTotalNum ? this.pageIndex = this.pageTotalNum : null
  },
  selectPage: function(n) {
  if (n === this.pageIndex) return
  if (typeof n === 'string') return
  this.pageIndex = n
  },
  handleGoToPage: function() {
  this.pageIndex = this.goToPage <= 1 ? 1 : this.goToPage - 0 >= this.pageTotalNum - 0 ? this.pageTotalNum :
  this.goToPage
  this.goToPage = this.pageIndex
  },
 },
 computed: {
  pageTotalNum:function(){
  return this.dataListLength % this.pageSize == 0 ? this.dataListLength / this.pageSize : Math.floor(this.dataListLength / this.pageSize) + 1
  },
  pages: function () {
  // 每次最多顯示5個(gè)頁(yè)碼
  var c = this.pageIndex
  var t = this.pageTotalNum
  var p = []
  for (var i = 1; i <= t; i++) {
   p.push(i)
  }
  var l = p.length
  if (l <= 5) { // 總頁(yè)數(shù)<=5，顯示全部頁(yè)碼
   return p
  } else if (l > 5 && c <= 3) { // 總頁(yè)數(shù)>5 && 當(dāng)前頁(yè)面<=3
   return [1, 2, 3, 4, '...', t] 
  } else if (l > 5 && c > 3 && c <= l - 2) { // 總頁(yè)數(shù) > 5 && 當(dāng)前頁(yè)面 > 3 && 當(dāng)前頁(yè) < 總頁(yè)數(shù) - 3
   return [1, '...', c - 2, c - 1, c, '...', t] 
  } else { // 總頁(yè)數(shù) > 5 && 當(dāng)前頁(yè)面 > 3 && 當(dāng)前頁(yè) > 總頁(yè)數(shù) - 3
   return [1, '...', t - 3, t - 2, t - 1, t] 
  }
  },
 },
 watch:{
  pageSize:function(nv,ov){
  this.pageIndex = 1
  }
 }
 });
</script>