src/components/rk-page.vue

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<template>
  <span class="rk-page flex-h">
    <svg class="icon cp mr-5" @click="pre">
      <use xlink:href="#chevron-left"></use>
    </svg>
    <input class="rk-page-input tc mr-5" type="text" v-model="currentShowPage" @keyup.enter="goToCertainPage" />
    <span class="mr-5">/</span>
    <span class="mr-5">{{ Math.ceil(this.total / this.currentSize) }}</span>
    <svg class="icon cp" @click="next">
      <use xlink:href="#chevron-right"></use>
    </svg>
  </span>
</template>
<script lang="ts">
  import { Component, Vue, Watch, Prop } from 'vue-property-decorator';

  @Component
  export default class RkPage extends Vue {
    @Prop() public currentPage!: number ;
    @Prop() public currentSize!: number ;
    @Prop() public total!: number ;

    public currentShowPage: string = this.currentPage.toString();
    get last(): number {
      if (this.currentPage * this.currentSize > this.total) {
        return this.total;
      }
      return this.currentPage * this.currentSize;
    }
    get totalPages(): number {
      return Math.ceil(this.total / this.currentSize);
    }

    private next(): void {
      if ( Number(this.currentShowPage) < this.totalPages) {
        this.currentShowPage = String(Number(this.currentShowPage) + 1);
        this.$emit('changePage', this.currentShowPage);
      }
    }

    private  pre(): void {
      if ( Number(this.currentShowPage) > 1 ) {
        this.currentShowPage = String(Number(this.currentShowPage) - 1);
        this.$emit('changePage', this.currentShowPage);
      }
    }

    private  goToCertainPage() {
      const regInt: RegExp = /^0*[1-9]\d*$/;
      if (regInt.test( this.currentShowPage.toString() ) && Number(this.currentShowPage) <= this.totalPages) {
        this.$emit('changePage', this.currentShowPage);
      }
    }
  }
</script>
<style lang="scss">
  .rk-page {
    display: inline-flex;
    .icon {
      padding: 3px;
      opacity: 0.5;
      &:hover {
        opacity: 1;
        color: #448dfe;
      }
    }
  }
  .rk-page-input {
    width: 40px;
    outline: 0;
    border-style: unset;
    border-radius: 4px;
    border: 1px solid #c1c5ca55;
  }
</style>