Vue.component('pagination', {
  template: `<nav aria-label="Page navigation">
    <ul class="pagination">
      <li :class="{'disabled': pageNum == 1}"><a href="#" v-on:click.prevent="turnToPage(1)" title="首页" aria-label="首页"><i class="fa fa-fast-backward"></i></a></li>
      <li :class="{'disabled': pageNum == 1}"><a href="#" v-on:click.prevent="turnToPage(pageNum - 1)" title="上一页" aria-label="上一页"><i class="fa fa-backward"></i></a></li>
      <li v-if="pageNum > 4"><a href="#" v-on:click.prevent="turnToPage(pageNum - 4)">...</a></li>
      <li v-if="pageNum <= 4 && pageNum >1"><a href="#" v-on:click.prevent="turnToPage(1)">1</a></li>
      <li v-if="pageNum - 3 > 1"><a href="#" v-on:click.prevent="turnToPage(pageNum - 3)">{{pageNum-3}}</a></li>
      <li v-if="pageNum - 2 > 1"><a href="#" v-on:click.prevent="turnToPage(pageNum - 2)">{{pageNum-2}}</a></li>
      <li v-if="pageNum - 1 > 1"><a href="#" v-on:click.prevent="turnToPage(pageNum - 1)">{{pageNum-1}}</a></li>
      <li class="active"><a href="#" v-on:click.prevent="turnToPage(pageNum)">{{pageNum}}</a></li>
      <li v-if="pageNum + 1 < pageTotal"><a href="#" v-on:click.prevent="turnToPage(pageNum + 1)">{{pageNum+1}}</a></li>
      <li v-if="pageNum + 2 < pageTotal"><a href="#" v-on:click.prevent="turnToPage(pageNum + 2)">{{pageNum+2}}</a></li>
      <li v-if="pageNum + 3 < pageTotal"><a href="#" v-on:click.prevent="turnToPage(pageNum + 3)">{{pageNum+3}}</a></li>
      <li v-if="pageNum >= pageTotal - 4 && pageNum < pageTotal"><a href="#" v-on:click.prevent="turnToPage(pageTotal)">{{pageTotal}}</a></li>
      <li v-if="pageNum < pageTotal - 4"><a href="#" v-on:click.prevent="turnToPage(pageNum + 4)">...</a></li>
      <li :class="{'disabled': pageNum == pageTotal}"><a href="#" v-on:click.prevent="turnToPage(pageNum + 1)" title="下一页" aria-label="下一页"><i class="fa fa-forward"></i></a></li>
      <li :class="{'disabled': pageNum == pageTotal}"><a href="#" v-on:click.prevent="turnToPage(pageTotal)" title="尾页" aria-label="尾页"><i class="fa fa-fast-forward"></i></a></li>
    </ul>
  </nav>`,
  props: {
    pageNum: Number,
    pageSize: Number,
    totalItemCount: Number,
  },
  computed: {
    pageTotal: function () {
      return Math.ceil(this.totalItemCount / this.pageSize)
    }
  },
  methods: {
    turnToPage: function (num) {
      if (num > this.pageTotal || num <= 0) {
        //toastr.error(`当前页码超出了范围。页码：${num}`, '错误')
        return false
      }
      this.$emit('change', num)
    }
  }
})

let vm = new Vue({
  el: '#app',
  data: {
    criteria: {
      keyword: '',
      page: { num: 1, size: 10 }
    },
    itemsCount: 0
  },
　　methods: {　　
　　　　skiptoPage: function (num) {  
　　　　　　　　this.criteria.page.num = num;
　　　　}
　　}
});