分页组件

于2023-08-10 23:18:08发布
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
        }

        ul {
            list-style-type: none;
            display: flex;
        }

        li {
            padding: 0 10px;
            cursor: pointer;
        }

        .on {
            color: #c00;
        }
    </style>
</head>

<body>
    <div id="app">
        <ul>
            <li v-if="pageNum > maxShowNum" @click="set('prev')">上一页</li>
            <template v-if="pageNum > maxShowNum">
                <li @click="set(1, true)">1</li>
                <li>...</li>
            </template>
            <li v-for="(item, key) in list" :key="key" :class="{'on' : item === pageNum}" @click="set(item)">{{ item }}</li>
            <template v-if="list.length >= maxShowNum && !list.includes(pagination[pagination.length - 1])">
                <li>...</li>
                <li @click="set(pagination[pagination.length - 1], true)">{{ pagination[pagination.length - 1] }}</li>
                <li @click="set('next')">下一页</li>
            </template>
        </ul>
    </div>
    <script src="./vue.js"></script>
    <script>
        new Vue({
            el: '#app',
            data() {
                return {
                    total: 50, // 总条数
                    pageSize: 3, // 一页显示多少条
                    pageNum: 1, // 当前页码
                    pagination: [], // 页码数组
                    list: [], // 要显示的页码数组
                    maxShowNum : 5, // 最大展示的页码数
                    start: 0, // 开始
                    end: 0, // 结束
                }
            },
            methods: {
                set(item, flag) {
                    if (item === 'prev') {
                        this.pageNum--;
                        if (this.pageNum <= 0) {
                            this.pageNum = 1;
                        }
                        if (!this.list.includes(this.pageNum)) {
                            this.start -= this.maxShowNum;
                            this.end -= this.maxShowNum;
                            this.list = this.pagination.slice(this.start, this.end);
                        }
                    } else if (item === 'next') {
                        this.pageNum++;
                        if (this.pageNum > this.pagination.length) {
                            this.pageNum = this.pagination.length;
                        }
                       
                        if (!this.list.includes(this.pageNum)) {
                            this.start += this.maxShowNum;
                            this.end += this.maxShowNum;
                            this.list = this.pagination.slice(this.start, this.end);
                        }
                    } else {
                        this.pageNum = item;
                        if (flag) {
                            if (this.pageNum >= this.pagination[this.pagination.length - 1]) {
                                const num = Math.ceil(this.pageNum / this.maxShowNum) * this.maxShowNum;
                                this.start = num - this.maxShowNum;
                                this.end = num;
                            } else {
                                this.start = 0;
                                this.end = this.maxShowNum;
                            }
                            this.list = this.pagination.slice(this.start, this.end);
                        }
                    }
                },
                addPagination() {
                    var p = Math.ceil(this.total / this.pageSize);
                    for (var i = 1; i <= p; i++) {
                        this.pagination.push(i);
                    }
                    this.list = this.pagination.slice(this.start, this.end);
                }
            },
            created() {
                this.end = this.maxShowNum;
                if (this.pageSize <= 0) {
                    this.pageSize = 1;
                }
                this.addPagination();
            }
        })
    </script>
</body>

</html>