分页

//分页
    
   //父组件
    
    <pageSize 
      :name="name"
      @change="onPageChange"
      :page-size="size"
      :total="total"
      layout="jumper,total"
      :current-page="curPage"
    />
    
方法及参数说明
属性 
page-size 每页显示条目个数
total 总条目数
current-page 当前页数
layout 布局 默认不显示 jumper,total

事件
change 当前页改变时触发



//子组件

    <template>
  <div class="paging clearfix">
     <div class="page-size fl" v-if="isShowTotal">共{{total}}条</div>
       <ul class="page-list fl clearfix">
            <li @click="changePage(currentPage-1)">上一页</li>
            <li :class="{'active':currentPage==item.val}" v-for="item in pagelist" v-text="item.text" @click="changePage(item.val)">1</li>
            <li @click="changePage(currentPage+1)">下一页</li>
        </ul>
        <div class="page-jump fl" v-if="isShowJumper">
            前往<input class="input" type="text" v-model="toPage" @keydown="submit(toPage,$event)">页
            <!-- <button  @click="changePage(toPage)">确定</button> -->
        </div>
  </div>
</template>

<script>
export default {
  name: 'Paging',
  // props:[
  //    'name'
  // ],
  // prop验证
  props:{
    name:String,
    pageSize: {
      type: Number,
      default: 10
    },
    total: {
      type: Number,
      default: 0
    },
    currentPage: {
      type: Number,
      default: 1
    },
    layout:{
        type: String
    }
  },
  data () {
    return {
            isShowJumper:false,
            isShowTotal:false,
        toPage:'',//跳转到x页
            pageGroup:10//可见分页数量 默认10个分页数
    }
  },
  created: function () {
        console.log('created');
        this.isShowTotal = this.layout.indexOf('total')!==-1;
        this.isShowJumper = this.layout.indexOf('jumper')!==-1;
    },
    mounted: function () {
        console.log('mounted',this.layout);
    },
    computed:{
        totalPage:function(){
            return Math.ceil(this.total / this.pageSize)
        },
        pagelist:function(){
            var list = [];
            var count = Math.floor(this.pageGroup/2), center = this.currentPage;
            var left = 1,right = this.totalPage;

            if(this.totalPage>this.pageGroup){
                if(this.currentPage>count+1){
                    if(this.currentPage < this.totalPage - count){
                        left = this.currentPage - count;
                        right = this.currentPage + count-1;
                    }else{
                        left = this.totalPage - this.pageGroup+1;
                    }
                }else{
                    right = this.pageGroup;
                }
            }

            // 遍历添加到数组里
            while(left<=right){
                list.push({
                    text:left,
                    val:left
                });
                left++;
            }
            return list;
        }
    },
  methods:{
    // 回车事件
    submit(toPage,e){
        // console.log('e.keyCode',toPage,e.keyCode)
        // key.Code === 13表示回车键 
        if(e.keyCode === 13){
            //逻辑处理
            this.changePage(toPage);
        }
    },
    changePage:function(idx){
        if(idx!=this.currentPage && idx>0 && idx<=this.totalPage){
            // 触发父组件事件  pageChange会转换成小写pagechange
            this.$emit('change',{curPage:Number(idx)});
            }
    }
    }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
*{
        padding: 0;
        margin: 0;
}
.fl{
    float: left;
}
.clearfix:after{
    display: block;
    content: '';
    clear: both;
}
.page-size{
        height: 26px;
    line-height: 26px;
}
.page-list{

}
.page-jump{
        height: 26px;
    line-height: 26px;
    margin-left: 20px;
}
.page-jump .input{
    width: 32px;
        padding: 4px 2px;
    border-radius: 2px;
    border: 1px solid #dcdfe6;
    margin: 0 4px;
}
    ul{
        list-style: none;
    }
    ul li{
        float: left;
        color: #606266;
        background: #f4f4f5;
        padding: 2px 8px;
        cursor: pointer;
        border-radius: 2px;
        margin: 0 5px;
    }
    ul>li.active{
        background: #409eff;
        color:#fff;
    }
</style>