要对齐弹性项目，请使用justify-content- *类。
使用以下任何一种方法在开始，结束，周围和之间对齐弹性项目。
justify-content-start – Align Flex items at the startjustify-content-end - Align Flex items at the endjustify-content-around – Align flex items around on different screen sizesjustify-content-between - Alex flex items in between on difference screen sizes
让我们看一个在开始时设置flex项目的示例-
<div class="d-flex justify-content-start bg-primary mb-5"> <div class="p-2 bg-danger">RANK 1</div> <div class="p-2 bg-secondary">RANK 2</div> <div class="p-2 bg-warning">RANK3</div> </div>
以下是实现justify-content- *类的示例-
<!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"> <div class="d-flex justify-content-start bg-primary mb-5"> <div class="p-2 bg-danger">RANK 1</div> <div class="p-2 bg-secondary">RANK 2</div> <div class="p-2 bg-warning">RANK3</div> </div> <div class="d-flex justify-content-end bg-info mb-5"> <div class="p-2 bg-danger">RANK 1</div> <div class="p-2 bg-primary">RANK 2</div> <div class="p-2 bg-warning">RANK 3</div> </div> <div class="d-flex justify-content-around bg-warning mb-5"> <div class="p-2 bg-danger">RANK 1</div> <div class="p-2 bg-info">RANK 2</div> <div class="p-2 bg-secondary">RANK 3</div> </div> </div> </body> </html>