在Bootstrap 4的不同屏幕中从头开始对齐收集的项目
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-
中等屏幕尺寸
<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>
大屏幕尺寸
<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Bootstrap4中为不同屏幕尺寸实现align-content-*start类-
示例
<!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>