CSS——轮播图中的箭头

注意事项：

1、定位中left权重比right高，top权重比bottom高

2、两个span标签嵌套在一个盒子中，将来显示隐藏只需要控制父盒子就行了

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .box {
            width: 400px;
            height: 300px;
            border: 1px solid #ccc;
            margin: 150px auto;
            position: relative;
        }

        .arrow {
            display: none;
        }

        span {
            position: absolute;
            top: 50%;
            margin-top: -40px;
            width: 30px;
            height: 80px;
            text-align: center;
            line-height: 80px;
            font-size: 40px;
            background: rgba(255, 198, 93, 0.3);
        }

        .left{
            left: 0px;
            border-radius: 0 10px 10px 0;
        }
        .right {
            right: 0px;
            border-radius: 10px 0 0 10px;
        }
    </style>
</head>
<body>
<div class="box">
    <div class="arrow">
        <span class="left">&lt;</span>
        <span class="right">&gt;</span>
    </div>
</div>
<script>
    var divEle = document.getElementsByTagName("div")[0];
    var arrEle = document.getElementsByTagName("div")[1];
    divEle.onmouseover = function () {
        arrEle.style.display = "block";
    }
    divEle.onmouseout = function () {
        arrEle.style.display = "none";
    }

</script>
</body>
</html>