lovecoding
/
web0715


			
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* > 为子代选择器 仅能选中儿子级别的元素 如果孙子级则不好使 */
       .box > span{
        color: red;
        }
        /* 兄弟选择器 仅能选中他的下一个相邻的兄弟 */
        .box3+div{
            color: red;
        }
        .box3 ~ div{
            color: blue;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="box2">
            <span>hello</span>
        </div>
    </div>
    <span>world</span>


    <div class="box3">a</div>
    <div>b</div>
    <div>c</div>
</body>
</html>