如果要将弹性项目包装在Bootstrap中，请使用flex-wrap类。要包装，请使用-
<div class="d-flex flex-wrap>
然后添加要包装在其中的flex项目-
<div class="d-flex flex-wrap> <div class="p-2 border">India</div> <div class="p-2 border">US</div> <div class="p-2 border">UK</div> <div class="p-2 border">Australia</div> <div class="p-2 border">Denmark</div> </div>
您可以尝试运行以下代码，以避免包装弹性项目-
<!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"> <h3>Flex Examples</h3> <p>Wrap - Yes</p> <div class="d-flex flex-wrap bg-primary"> <div class="p-2 border">India</div> <div class="p-2 border">US</div> <div class="p-2 border">UK</div> <div class="p-2 border">Australia</div> <div class="p-2 border">Denmark</div> <div class="p-2 border">India</div> <div class="p-2 border">Poland</div> <div class="p-2 border">Netherlands</div> <div class="p-2 border">Ireland</div> <div class="p-2 border">Brazil</div> <div class="p-2 border">Russia</div> <div class="p-2 border">Morocco</div> </div><br> <p>Wrap - No</p> <div class="d-flex flex-nowrap bg-primary"> <div class="p-2 border">India</div> <div class="p-2 border">US</div> <div class="p-2 border">UK</div> <div class="p-2 border">Australia</div> <div class="p-2 border">Denmark</div> <div class="p-2 border">India</div> <div class="p-2 border">Poland</div> <div class="p-2 border">Netherlands</div> <div class="p-2 border">Ireland</div> <div class="p-2 border">Brazil</div> <div class="p-2 border">Russia</div> <div class="p-2 border">Morocco</div> </div><br> </div> </body> </html>