要从头开始在不同屏幕中对齐收集的项目，请使用.align-content-*-start类。
如下图所示以不同的屏幕尺寸对齐项目-
<div class="d-flex flex-wrap align-content-md-start bg-primary" style="height:250px"> <div class="p-2 border">Work 1</div> <div class="p-2 border">Work 2</div> <div class="p-2 border">Work 3</div> <div class="p-2 border">Work 4</div> <div class="p-2 border">Work 5</div> </div>
<div class="d-flex flex-wrap align-content-lg-start bg-primary" style="height:250px"> <div class="p-2 border">Work 1</div> <div class="p-2 border">Work 2</div> <div class="p-2 border">Work 3</div> <div class="p-2 border">Work 4</div> <div class="p-2 border">Work 5</div> </div>
您可以尝试运行以下代码以在Bootstrap 4中为不同屏幕尺寸实现align-content- * start类-
<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script> </head> <body> <div class="container mt-3"> <h2>Aligning Flex Items</h2> <div class="d-flex flex-wrap align-content-start bg-primary" style="height:250px"> <div class="p-2 border">Work 1</div> <div class="p-2 border">Work 2</div> <div class="p-2 border">Work 3</div> <div class="p-2 border">Work 4</div> <div class="p-2 border">Work 5</div> <div class="p-2 border">Work 6</div> <div class="p-2 border">Work 7</div> <div class="p-2 border">Work 8</div> <div class="p-2 border">Work 9</div> <div class="p-2 border">Work 10</div> <div class="p-2 border">Work 11</div> <div class="p-2 border">Work 12</div> <div class="p-2 border">Work 13</div> <div class="p-2 border">Work 14</div> </div> <h2>Small Screen Size</h2> <div class="d-flex flex-wrap align-content-sm-start bg-primary" style="height:250px"> <div class="p-2 border">Work 1</div> <div class="p-2 border">Work 2</div> <div class="p-2 border">Work 3</div> <div class="p-2 border">Work 4</div> <div class="p-2 border">Work 5</div> <div class="p-2 border">Work 6</div> <div class="p-2 border">Work 7</div> <div class="p-2 border">Work 8</div> <div class="p-2 border">Work 9</div> <div class="p-2 border">Work 10</div> <div class="p-2 border">Work 11</div> <div class="p-2 border">Work 12</div> <div class="p-2 border">Work 13</div> <div class="p-2 border">Work 14</div> </div> <h2>Medium Screen Size</h2> <div class="d-flex flex-wrap align-content-md-start bg-primary" style="height:250px"> <div class="p-2 border">Work 1</div> <div class="p-2 border">Work 2</div> <div class="p-2 border">Work 3</div> <div class="p-2 border">Work 4</div> <div class="p-2 border">Work 5</div> <div class="p-2 border">Work 6</div> <div class="p-2 border">Work 7</div> <div class="p-2 border">Work 8</div> <div class="p-2 border">Work 9</div> <div class="p-2 border">Work 10</div> <div class="p-2 border">Work 11</div> <div class="p-2 border">Work 12</div> <div class="p-2 border">Work 13</div> <div class="p-2 border">Work 14</div> </div> <h2>Large Screen Size</h2> <div class="d-flex flex-wrap align-content-lg-start bg-primary" style="height:250px"> <div class="p-2 border">Work 1</div> <div class="p-2 border">Work 2</div> <div class="p-2 border">Work 3</div> <div class="p-2 border">Work 4</div> <div class="p-2 border">Work 5</div> <div class="p-2 border">Work 6</div> <div class="p-2 border">Work 7</div> <div class="p-2 border">Work 8</div> <div class="p-2 border">Work 9</div> <div class="p-2 border">Work 10</div> <div class="p-2 border">Work 11</div> <div class="p-2 border">Work 12</div> <div class="p-2 border">Work 13</div> <div class="p-2 border">Work 14</div> </div> </div> </body> </html>