CSS模拟表格斜线

CSS模拟表格斜线

1. 原理
   利用div+css模拟表格的对角线，容器相邻边的border宽度大于1时，且相邻边框颜色不一样，会形成一个斜线，具体代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style type="text/css">
        .div {
            border-left: #023060 20px solid;
            border-right: #366AA1 20px solid;
            border-top: #0F2E4E 20px solid;
            border-bottom: #548CC7 20px solid;
            width: 120px;
            margin: 0px auto;
            text-align: center;
            font-size: 12px;
            line-height: 22px;
            color: #bbdcff;
            background-color: #194D83;
        }
    </style>
    <title>运用css模拟表格</title>
</head>

<body>
    <div class="div">测试内容</div>
</body>
</html>

案例：

<!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 type="text/css">
        * {
            padding: 0;
            margin: 0;
        }

        caption {
            font-size: 14px;
            font-weight: bold;
        }

        table {
            border-collapse: collapse;
            border: 1px #525152 solid;
            width: 50%;
            margin: 0 auto;
            margin-top: 100px;
        }

        th,
        td {
            border: 1px #525152 solid;
            text-align: center;
            font-size: 12px;
            line-height: 30px;
            background: #C6C7C6;
        }

        th {
            background: #D6D3D6;
        }

        /*模拟对角线*/
        .out {
            border-top: 40px #D6D3D6 solid;
            /*上边框宽度等于表格第一行行高*/
            width: 0px;
            /*让容器宽度为0*/
            height: 0px;
            /*让容器高度为0*/
            border-left: 80px #BDBABD solid;
            /*左边框宽度等于表格第一行第一格宽度*/
            position: relative;
            /*让里面的两个子容器绝对定位*/
        }

        b {
            font-style: normal;
            display: block;
            position: absolute;
            top: -40px;
            left: -40px;
            width: 35px;
        }

        em {
            font-style: normal;
            display: block;
            position: absolute;
            top: -25px;
            left: -70px;
            width: 55x;
        }

        .t1 {
            background: #BDBABD;
        }
    </style>
</head>

<body>
    <table>
        <caption>用div+css模拟表格对角线</caption>
        <tr>
            <th style="width:80px;">
                <div class="out"> <b>类别</b> <em>姓名</em> </div>
            </th>
            <th>年级</th>
            <th>班级</th>
            <th>成绩</th>
            <th>班级均分</th>
        </tr>
        <tr>
            <td class="t1">张三</td>
            <td>三</td>
            <td>2</td>
            <td>62</td>
            <td>61</td>
        </tr>
        <tr>
            <td class="t1">李四</td>
            <td>三</td>
            <td>1</td>
            <td>48</td>
            <td>67</td>
        </tr>
        <tr>
            <td class="t1">王五</td>
            <td>三</td>
            <td>5</td>
            <td>79</td>
            <td>63</td>
        </tr>
        <tr>
            <td class="t1">赵六</td>
            <td>三</td>
            <td>4</td>
            <td>89</td>
            <td>66</td>
        </tr>
    </table>
</body>

</html>

效果如下：