vue如何自定义翻页组件

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效果图如下：

1、在components建立page.vue文件

<template>
    <div class="pagination">
        <!-- 上 -->
        <button :disabled="pageNo == 1" @click="getPageNo(pageNo - 1)">
            上一张
        </button>
        <button
                v-if="startNumAndEndNum.start > 1"
                @click="getPageNo(1)"
                :class="{ active: pageNo == 1 }"
        >1
        </button>
        <button
                v-if="startNumAndEndNum.start > 2"
                @click="getPageNo(pageNo - continues)"
        >···
        </button>
        <!-- 中间部分 -->
        <button
                v-for="(page, index) in generateMiddlePage"
                :key="index"
                @click="getPageNo(page)"
                :class="{ active: pageNo == page }">
            {{ page }}
        </button>
 
        <!-- 下 -->
        <button
                v-if="startNumAndEndNum.end < totalPage - 1"
                @click="getPageNo(pageNo +continues)"
        >···
        </button>
        <button
                v-if="startNumAndEndNum.end < totalPage"
                @click="getPageNo(totalPage)"
                :class="{active:pageNo==totalPage}">
            {{ totalPage }}
        </button>
        <button
                :disabled="pageNo == totalPage"
                @click="getPageNo(pageNo + 1)">
            下一张
        </button>
    </div>
</template>
 
<script>
 
    export default {
        name: "Pagination",
        props: ["pageNo", "pageSize", "total", "continues"],
        computed: {
            //计算出总页数
            totalPage() {
                 //向上取整
                return Math.ceil(this.total / this.pageSize);
            },
                 //计算出页码的起始和结束数字
            startNumAndEndNum() {
                const {continues, pageNo, totalPage} = this;
                    //先定义两个变量存储起始数字与结束数字
                let start = 0,
                    end = 0;
                if (continues > totalPage) {
                    start = 1;
                    end = totalPage;
                } else {
                          //起始数字
                    start = pageNo - parseInt(continues / 2);
                         //结束数字
                    end = pageNo + parseInt(continues / 2);
                    
                    if (start < 1) {
                        start = 1;
                        end = continues;
                    }
                    
                    if (end > totalPage) {
                        end = totalPage;
                        start = totalPage - continues + 1;
                    }
                }
                return {start, end};
            },
            //过滤掉小于起始页的页码
            generateMiddlePage() {
                let arr = [];
                //避免页面中同时使用 v-for和v-if 
                for (let i = 0; i <= this.startNumAndEndNum.end; i++) {
                    arr.push(i)
                }
                let temp = arr.filter(item => {
                    return item >= this.startNumAndEndNum.start
                })
                return temp
            }
        },
        methods: {
            getPageNo(val) {
                //自定义事件子页面向父页面传参，计算属性值
                this.$emit('getPageNo', val)
            },
        }
    };
</script>
 
<style lang="scss" scoped>
    .pagination {
        text-align: center;
        width: 70px;
        button {
            margin:12px 0px 0px 0px;
            background-color: #fff;
            color: #409eff;
            border:1px solid #409eff;
            outline: none;
            border-radius: 2px;
            padding: 0 4px;
            vertical-align: top;
            display: inline-block;
            font-size: 14px;
            width: 60px;
            height: 38px;
            line-height: 38px;
            cursor: pointer;
            box-sizing: border-box;
            text-align: center;
 
            &[disabled] {
                color: #c0c4cc;
                cursor: not-allowed;
                 border:1px solid #ddd;
            }
            &:hover{
              background: #ddeffb;
            }
            &[disabled]:hover{ background: none;}
            &.active {
                cursor: not-allowed;
                background-color: #409eff;
                color: #fff;
            }
        }
    }
</style>

2、在页面中引入组件

<page
        :pageNo="pageNo"
        :pageSize="pageSize"
        :total="pageTotal"
        :continues="5"  //超过5时中建按钮有省略号
        @getPageNo="getPageNo"
        />
 
import page from '@/components/page'
 
data(){
   return{
     pageNo:1,
     pageSize:1, 
     pageTotal:5,
   }
}
 
//方法中
methods:{
     getPageNo(pageNo){
        this.pageNo=pageNo
      },
  }

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