flex两端对齐换行后格式不对的应对方法

.logo{
100%;
height: 25rem;
margin-top: 60px;
}
.logo ul{
display: flex;
justify-content: space-between;
flex-wrap: wrap;
}
.logo ul:after{
content: '';
58%;
border:1px solid transparent;
}

.item:last-child:nth-child(3n - 1) {
margin-right: calc(40.5% + 3% / 3);
}
/* 如果最后一行是2个元素 */
.item:last-child:nth-child(5n - 1) {
margin-right: calc(20% + 3% / 5);
}

<div class="logo">
                    <ul>
                        <li v-for="furn in furniture" class="item">
                            <img :src="furn.logo" >
                        </li>
                    </ul>
                </div>