learnJavaScript/table.html at main · mikebars1995/learnJavaScript · GitHub

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<!DOCTYPE HTML>
<html>

<head>
    <style>
        table {
            border-collapse: collapse;
        }

        td {
            border: 3px solid black;
            padding: 5px 8px;
        }
    </style>
</head>

<body>
    <table>
        <tr>
            <td>1:1</td>
            <td>2:1</td>
            <td>3:1</td>
            <td>4:1</td>
            <td>5:1</td>
        </tr>
        <tr>
            <td>1:2</td>
            <td>2:2</td>
            <td>3:2</td>
            <td>4:2</td>
            <td>5:2</td>
        </tr>
        <tr>
            <td>1:3</td>
            <td>2:3</td>
            <td>3:3</td>
            <td>4:3</td>
            <td>5:3</td>
        </tr>
        <tr>
            <td>1:4</td>
            <td>2:4</td>
            <td>3:4</td>
            <td>4:4</td>
            <td>5:4</td>
        </tr>
        <tr>
            <td>1:5</td>
            <td>2:5</td>
            <td>3:5</td>
            <td>4:5</td>
            <td>5:5</td>
        </tr>
    </table>
    <script>
        let table = document.body.firstElementChild;
        // table.rows[0].cells[0].style.backgroundColor = 'red'
        // table.rows[1].cells[1].style.backgroundColor = 'red'
        // table.rows[2].cells[2].style.backgroundColor = 'red'
        // table.rows[3].cells[3].style.backgroundColor = 'red'
        // table.rows[4].cells[4].style.backgroundColor = 'red'

        for (let i = 0; table.rows.length > i; i++) {
            table.rows[i].cells[i].style.backgroundColor = 'red';
        }

    </script>
</body>

</html>