二种方法js实现轮播图自动切换

第二种，图片切换，css代码

html,
body,
ul,
li {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

.loopbox {
    width: 1226px;
    height: 460px;
    background: #030;
    position: relative;
    overflow: hidden;
}

.box {
    width: 100%;
    height: 100%;
    float: left;
    transition: all .3s;
    position: absolute;
    left: 0;
    /* overflow: hidden; */
}
.box.notran{
    transition: none;
}

.box-item {
    /* width: 100%; */
    width: 1226px;
    height: 100%;
    float: left;
    background: #f1f1f1;
    text-align: center;
    font-size: 24px;
    line-height: 100px;
    /* display: none; */
    /* transition: all .3s; */
}

.box-item img {
    width: 100%;
    height: 100%;
    /* 图片适应 */
    object-fit: cover;
}

.arrow {
    width: 60px;
    line-height: 30px;
    background: #f00;
    text-align: center;
    color: #f1f1f1;
    position: absolute;
    top: 50%;
    left: 10px;
    margin-top: -15px;
    border-radius: 15px;
}

.arrow:hover {
    background: #f60;
}

.arrow.arrow-right {
    left: auto;
    right: 10px;
}

.page {
    position: absolute;
    width: 100%;
    text-align: center;
    bottom: 10px;
}

.page li {
    display: inline-block;
    width: 80px;
    height: 8px;
    border-radius: 4px;
    background: #000;
}
/* .page li:first-child {
    background: #f90;
} */

.page li:hover {
    background: #f60;
}

.page li.current {
    background: #f90;
}

.side-qq {
    width: 100px;
    height: 100px;
    background: #f00;
    /* position: fixed; */
    position: absolute;
    right: 10px;
    top: 450px;
}

.navbar {
    width: 100%;
    background: #ccc;
    text-align: center;
}

.navbar.fixed {
    position: fixed;
    left: 0;
    top: 0;
}

.nav {
    height: 21px;
}

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