<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title> New Document </title> <meta name="Generator" content="EditPlus"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <style>ul li{ background: url("images/navbar.png") no-repeat scroll 100% 50% transparent; float: left; list-style: none outside none; margin: 0 -1px 0 1px;}ul li a{ color: #C8DBE4; text-decoration: none; padding: 0px 10px;}ul li a:hover{ color: #FFFFFF;} </style> </head> <body style="background-color: blue;"><ul><li><a href="index.php"><span>首页</span></a></li><li><a href="#"><span>注册</span></a></li><li><a href="#"><span>登录</span></a></li><li><a href="#"><span>帮助</span></a></li></ul> </body></html> 这是代码中的navbar.png图片
这里的虚线效果是怎么实现的呀？我试了一下，如果去掉navbar.png这个图片，就没有虚线了，为什么？
回复讨论(解决方案)
没什么不明白的，这站图片有 白色的点点竖线，然后通过背景图片位置更换到那个背景
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title> New Document </title> <meta name="Generator" content="EditPlus"> <meta name="Author" content=""> <meta name="Keywords" content=""> <meta name="Description" content=""> <style>ul li{ background: url("images/navbar.png") no-repeat scroll 100% 50% transparent; float: left; list-style: none outside none; margin: 0 -1px 0 1px;}ul li a{ color: #C8DBE4; text-decoration: none; padding: 0px 10px;}ul li a:hover{ color: #FFFFFF;} </style> </head> <body style="background-color: blue;"><ul><li><a href="index.php"><span>首页</span></a></li><li><a href="#"><span>注册</span></a></li><li><a href="#"><span>登录</span></a></li><li><a href="#"><span>帮助</span></a></li></ul><img src="/static/imghwm/default1.png" data-src="images/navbar.png" class="lazy" / alt="有个效果没弄明白，请教高手_html/css_WEB-ITnose" ><!--增加图片就看到竖线了--> </body></html> png支持透明背景。
不信你可以做一个简单的实验，建立一个背景为透明的PHOTOSHOP新文档，然后用白色画一根线，另存为PNG图像。用ACDSEE打开，图片是不是一片空白？但是你设置成 background: url("images/navbar.png") no-repeat scroll 100% 50% transparent; 的形式，白线还是白线，而不是一片空白。
图片是看不到样式的，不知道是我电脑问题，还是没有发好~~
白点不用图片也能做到吧
看了半天，你发的图片，右边有四个竖着排的白点，你好好看看
下载下来，打开放大看，在最右边上，中间地方，以它做背景了
你把图片去掉了，当然"虚线"就没有了
谢谢各位
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