SCSS：检查元素是否具有属性

Question

我需要检查元素是否具有要在移动设备上（或在响应模式下）应用的样式的属性。例如：

<tr>
    <td>Some text here</td>
    <td data-content="Hello there">Other text here</td>
    <td data-content="Hi there">Final text here</td>
</tr>

浏览器：

------------------------------------------------------
| Some text here | Other text here | Final text here |
------------------------------------------------------

移动设备（必填输出）：

--------------------------------
| Some text here               |
| Hello there: Other text here | 
| Hi there: Final text here    |
--------------------------------

SCSS：

tr {
    td {
        ...

        @if (&[data-content]) {
            &:before {
                content: attr(data-content) ":";
                float: left;
                font-size: 12px;
                font-weight: bold;
                margin: 0 5px 0 0;
                text-transform: uppercase;
            }
        }
    }
}

移动设备（当前输出）：

--------------------------------
| : Some text here             |
| Hello there: Other text here | 
| Hi there: Final text here    |
--------------------------------

Answer 1

我找到了解决方案。显然，这很容易...

SCSS：

tr {
    td {
        ...

        &[data-content] {
            &:before {
                content: attr(data-content) ":";
                float: left;
                font-size: 12px;
                font-weight: bold;
                margin: 0 5px 0 0;
                text-transform: uppercase;
            }
        }
    }
}

当前输出：

--------------------------------
| Some text here               |
| Hello there: Other text here | 
| Hi there: Final text here    |
--------------------------------