Vue手写分页

1.自己定义一个组件wtecthtec-pagenation.vue 名字（自定义）

<template>
  <div class="page">
<!--    <span class="total-text"> 共 {{ pageInfo.total }} 条 </span>-->

<!--    <select class="form-control" @change="handlePageSize"  v-model="pageInfo.pageSize">-->
<!--      <option v-for="(sItem,index) in pageInfo.pageSizes" :value="sItem.value"   :key="index"  >-->
<!--        {{  sItem.name | filerPageSizes }}-->
<!--      </option>-->
<!--    </select>-->
    <svg-icon :icon-class="[currentPage === 1?'left_shallow' : 'left_deep']"></svg-icon>
    <span :class="[currentPage === 1?'no-activite' : 'can-activite','operation'] " @click="handleCurrenPage('up')" >上一页 </span>
    <span v-show="startPage > 1 && pageInfo.pageNums >= 7" > ... </span>
    <span  :class="[currentPage===pageVal ? 'activited':'can-activite']"
           v-for="pageVal in getShowPages()" :key="pageVal" @click="handleCurrenPage(pageVal)"> {{ pageVal }} </span>
    <span v-show="endPage < pageInfo.pageNums"> ... </span>
    <span :class="[currentPage === pageInfo.pageNums?'no-activite' : 'can-activite','operation'] " @click="handleCurrenPage('next')">下一页</span>
    <svg-icon :icon-class="[currentPage === pageInfo.pageNums?'right_shallow' : 'right_deep']"></svg-icon>
  </div>
</template>

<script>
  export default {
    props:{
      pageInfo:{
        type: Object,
      },
    },
    data(){
      return {
        currentPage:1,
        startPage:0,
        endPage:0
      }
    },
    watch:{ },
    filters:{
      filerPageSizes(item){
        if (Number.isInteger(item)) {
          return item +'条/页'
        }else {
          return item
        }
      }
    },
    created(){
      //   this.getPageNums()
    },
    updated(){
      this.getPageNums()
    },
    methods:{
      // 触发选择 条/页 事件
      handlePageSize(type){
        //  console.log('handlePageSize: ',this.pageInfo.pageSize)
        //   this.getPageNums()
        this.currentPage = 1
        this.$emit('handlePageSize', this.pageInfo.pageSize);
      },
      // 触发当前页码
      handleCurrenPage(val){
        // console.log('handleCurrenPage:',val)
        //上一页处理
        if (val === 'up') {
          if (this.currentPage === 1) return
          this.currentPage =   this.currentPage - 1
        }
        //下一页处理
        else  if (val === 'next') {
          if (this.currentPage === this.pageInfo.pageNums) return
          this.currentPage =   this.currentPage+ 1
        }  else {
          if ( this.currentPage === val) return
          this.currentPage = val
        }
        this.$emit('handleCurrenPage', this.currentPage);
      },
      // 计算共有多少页
      getPageNums(){
        let  nums = parseInt( this.pageInfo.total / this.pageInfo.pageSize)
        if (this.pageInfo.total % this.pageInfo.pageSize > 0){
          nums += 1
        }
        this.pageInfo.pageNums = nums

        //    console.log('getPageNums :', this.pageSize)
      },
      // 计算当前显示的页码
      getShowPages(){
        let showPages = []
        let start = this.currentPage > 3? this.currentPage - 3 : 1
        let end = this.pageInfo.pageNums > 7? this.currentPage + 3:this.pageInfo.pageNums
        if(this.pageInfo.pageNums <= 5) {
          start = 1
          end = this.pageInfo.pageNums
        } else {
          if (start === 1) end = 5
          if (end >  this.pageInfo.pageNums){
            start = (start - (end - this.pageInfo.pageNums) ) <= 0? 1 :  (start - (end - this.pageInfo.pageNums) )
            end = this.pageInfo.pageNums
          }
        }
        this.startPage =  start
        this.endPage = end
        for (start; start <= end; start++) {
          showPages.push(start)
        }
        return showPages
      }
    }
  }
</script>

<style scoped>
  .page {
    white-space: nowrap;
    padding: 2px 5px;
    color: #303133;
    font-size: 16px;
    font-weight: 700;
  }
  .total-text {
    margin-right: 10px;
    font-weight: 400;
    color: #606266;
    font-size: 1rem;
    line-height: 1.5;
  }
  .form-control{
    padding: .175rem .275rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: .25rem;
    transition: border-color .15s ease-in-out,box-shadow .15s ease-in-out;
  }
  /* 选择的样式 */
  .activited {
    color: #FAAA3C;
    cursor: default;
  }
  .operation{
    white-space: nowrap;
    padding: 2px 5px;
    color: #303133;
    font-weight: 700;
  }
  /*可以选择*/
  .can-activite{
    cursor: pointer;
  }
  /*不可以选择*/
  .no-activite{
    color:#C0C4CC;
    cursor: not-allowed;
  }
</style>

2.需要引入组件的页面

<template>
        <div style="width: 50%;display: flex;justify-content: space-around;">
          <PageCom  :page-info="pageInfo" @handlePageSize="handlePageSizeVal"  @handleCurrenPage="handleCurrenPageVal"></PageCom>
        </div>
</template>
<script>
import PageCom from '@/components/Pagenation/wtecthtec-pagenation'
    export default {
        name: 'index',
        components:{ PageCom },
        data () {
            pageInfo:{
              pageSizes:[
                {value: 10,name: 10},
                {value: 20,name: 20},
                {value: 30,name: 30},
              ],
              pageSize: 10,
              total:100,
              pageNums:10
            },
        },
        methods: {
          handlePageSizeVal(val){
            console.log(`当前选条/页 ${val}`)
          },
          handleCurrenPageVal(val){
            console.log(`当前页 ${val}`)
          }
        },
    }
</script>

3. 运行之后效果