vue 手写分页组件

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<template>
  <div class="xtx-pagination">
    <a href="javascript:;" class="disabled">上一页</a>
    <span>...</span>
    <a href="javascript:;" class="active">3</a>
    <a href="javascript:;">4</a>
    <a href="javascript:;">5</a>
    <a href="javascript:;">6</a>
    <a href="javascript:;">7</a>
    <span>...</span>
    <a href="javascript:;">下一页</a>
  </div>
</template>
<script>
export default {
  name: 'XtxPagination'
}
</script>
<style scoped lang="less">
.xtx-pagination {
  display: flex;
  justify-content: center;
  padding: 30px;
  > a {
    display: inline-block;
    padding: 5px 10px;
    border: 1px solid #e4e4e4;
    border-radius: 4px;
    margin-right: 10px;
    &:hover {
      color: @xtxColor;
    }
    &.active {
      background: @xtxColor;
      color: #fff;
      border-color: @xtxColor;
    }
    &.disabled {
      cursor: not-allowed;
      opacity: 0.4;
      &:hover {
        color: #333
      }
    }
  }
  > span {
    margin-right: 10px;
  }
}
</style>

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<template>
  <div class="xtx-pagination">
    <a href="javascript:;" v-if="myCurrentPage===1" class="disabled">上一页</a>
    <a href="javascript:;" v-else @click="go(-1)">上一页</a>
    <!-- 如果起点按钮大于2就显示 -->
    <span  v-if="pageInfo.start>2">...</span>
    <a href="javascript:;" @click="changePage(item)"  :class="{active: myCurrentPage === item}" v-for="(item,idx) in pageInfo.pager" :key="idx"> {{item}} </a>
    <!-- 如果当前终点按钮小于总页数就显示 当终点按钮是20总按钮也是20 就不显示 -->
    <span  v-if="pageInfo.end < pageInfo.pageCount">...</span>
    <!-- 如果当前按钮等于最后一页就禁止点击 disabled -->
     <a href="javascript:;" v-if="myCurrentPage==pageInfo.end" class="disabled">下一页</a>
     <a href="javascript:;" v-else @click="go(1)">下一页</a>
  </div>
</template>
<script>
import { computed, ref, watch } from 'vue'
export default {
  name: 'XtxPagination',
  props: {
    total: { type: Number, default: 100 },
    pageSize: { type: Number, default: 10 },
    currentPage: { type: Number, default: 1 },
    btnCount: { type: Number, default: 5 }
  },
  setup (props, { emit }) {
    const myTotal = ref(100) // 总条数
    const myPageSize = ref(5) // 每页共几条

    const myCurrentPage = ref(3) // 用户实时点击，修改

    const myBtnCount = ref(5) // 分页按钮的个数5个

    // 让当前的页码处于正中间
    // const pager = ref([1, 2, 3, 4, 5])

    // 根据上边信息，实时计算 pager，起始页码，结束页码
    const pageInfo = computed(() => {
      // 总页数 = 总条数/每页几条
      const pageCount = Math.ceil(myTotal.value / myPageSize.value)

      // 起点 = 当前页数-总页数/2  举例 3 - Math.floor(5/2)  = 1
      let start = myCurrentPage.value - Math.floor((myBtnCount.value / 2))

      // 终点 = 起点页数 + 总页数 - 1  距离 1 + 5 -1 || 3 + 5 -1
      let end = start + myBtnCount.value - 1
      // 意外1 当起点小于1
      if (start < 1) {
        start = 1
        // 终点= 当前页数>总页数？总页数 否则 当前页数
        end = myBtnCount.value > pageCount ? pageCount : myBtnCount.value
      }

      // 意外2  当终点大于最大页码
      if (end > pageCount) {
        end = pageCount
        // 起点= 终点+（-所有页数+1）>1？1:= 终点+（-所有页数+1）
        start = (end - myBtnCount.value + 1) < 1 ? 1 : (end - myBtnCount.value + 1)
      }

      const pager = []
      for (let i = start; i <= end; i++) {
        pager.push(i)
      }
      return { start, end, pageCount, pager }
    })

    // 上一页下一页
    const go = (step) => {
      myCurrentPage.value += step
    }
    const changePage = (page) => {
      // 如果等于现在页页码 保持不动
      if (page === myCurrentPage.value) return
      myCurrentPage.value = page
      emit('currentCahnge', page)
    }

    // 监听传入的值改变
    watch(props, () => {
      myTotal.value = props.total
      myPageSize.value = props.pageSize
      myCurrentPage.value = props.currentPage
      myBtnCount.value = props.btnCount
    }, { immediate: true })
    return { myTotal, myPageSize, myCurrentPage, myBtnCount, pageInfo, go, changePage }
  }
}
</script>
<style scoped lang="less">
.xtx-pagination {
  display: flex;
  justify-content: center;
  padding: 30px;
  > a {
    display: inline-block;
    padding: 5px 10px;
    border: 1px solid #e4e4e4;
    border-radius: 4px;
    margin-right: 10px;
    &:hover {
      color: @xtxColor;
    }
    &.active {
      background: @xtxColor;
      color: #fff;
      border-color: @xtxColor;
    }
    &.disabled {
      cursor: not-allowed;
      opacity: 0.4;
      &:hover {
        color: #333
      }
    }
  }
  > span {
    margin-right: 10px;
  }
}
</style>

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<XtxPagination @currentCahnge="changePager" :total="total" :currentPage="reqParams.page"/>