png file location: xampp/htdocs/project/images/icons.png;
css file location: xampp/htdocs/project/resources/style.css;
html file location: xampp/htdocs/project/index.html;
当路径background-image: url(/images/icons.png)在实时服务器上工作时，在本地主机上则不工作。期待您的答案：D
因为图像在另一个目录中，我建议放置图像的确切路径。
background-image: url(../images/icons.png);