Vue分页组件实现过程详解

<template>
      <div class="paging" v-if="count">
        <ul>
            <li class="pre" v-show="page > 1" @click="jian()">
                <span>上一页</span>
            </li>
            <li v-for="(item,index) in pageall" :key="index" 
            :class="{'active': page === item, 'ellipsis': item === '...'}" 
            @click="res_page(item)">
            {{item}}</li>
            <li class="next" v-show="page < totalPages" @click="jia()">
                <span>下一页</span>
            </li>
        </ul>
        <span class="sum">共 {{totalPages}} 页, 跳至</span>
        <input type="text" @keyup.enter="activePage($event)">
        <span>页</span>
    </div>
</template>

prop:['count','page','page_size']

totalPages(){
	return Math.ceil(this.count / this.paeg_size)
}

beforePages(){
	return this.page -2
}

afterPages(){   
    return this.page + 2
},

pageall(){
    let arr=[]
    for(let everyPages = this.beforePages; everyPages <= this.afterPages; everyPages++) {
        if(everyPages > this.totalPages) {
            continue;
        }
        if(everyPages <= 0){
            continue;
        }
       arr.push(everyPages)
    }
    // 添加第一页
    if(this.page > 3 {
        arr.unshift(1)
    }
    // 添加最后一页
    if(this.page < this.totalPages-2) {
        arr.push(this.totalPages)
    }
    //添加前省略
    if(this.page >= 5) {
    	if(this.totalPages > 5) {
    		arr.splice(1,0,'...')
    	}else{
    		arr.splice(1,0,2)
    	}
    }
    //添加后省略
    if(this.page <= this.totalPages-4) {
    	if(this.totalPages > 5) {
    		arr.splice(arr.length-1,0,"...")
    	}else{
    		arr.splice(arr.length-1,0,4)
    	}
   }
    return arr
}

jia(){
	this.$emit('update:changepage',  this.page + 1)
}

jian(){
	this.$emit('update:changepage',  this.page - 1)
}

res_page(value){
	if(value!=="..."){
		this.$emit('update:changepage',  value)
	}V
}

activePage(e){
    if(e.target.value > this.totalPages) {
        this.$emit('update:changepage', this.totalPages)
    }else if(e.target.value <= 0) {
        this.$emit('update:changepage', 1)
    }else{
        this.$emit('update:changepage', e.target.value - 0)
    }
    e.target.value = ""
    e.target.blur()
}

       .paging {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #657180;
            ul {
                padding: 5px;
                display: inline-flex;
                background-color: #FFF;
                li {
                    width: 40px;
                    height: 40px;
                    margin: 0 2px;
                    border-radius:5px;
                    border: 1px solid #d7dde4;
                    list-style: none;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    caret-color: transparent;
                    cursor:pointer;
                }
                li:first-child{
                    width: 80px;
                    border-radius: 40px 0 0 40px;
                    span {
                        color: #000000;
                    }
                }
                li:last-child{
                    width: 80px;
                    border-radius: 0 40px 40px 0;
                    span {
                        color: #000000;
                    }
                }
                li:hover {
                    color: #00a1d6;
                    transition: all 0.5s;
                    border-color: #00a1d6;
                }
                .ellipsis {
                    border: none;
                }
                .ellipsis:hover {
                    color: #657180;
                }
                .active{
                    background-color: #00a1d6;
                    color: #FFF;
                }
            }
            .sum {
                margin-left: 30px;
            }
            span{
                font-size: 13px;
                color: #99a2aa;
            }
            input {
                height: 30px;
                width: 60px;
                border-radius: 5px;
                border: 1px solid #d7dde4;
                margin: 0 10px;
                outline: none;
            }
        }