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这是我的 html，我的 css 在我正在构建下拉导航的 html 之后。它在实时视图中有效，但在任何测试浏览器中均无效，并且我的页面未链接。为什么？有人可以帮忙吗？谢谢你...

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <title>index</title>
    <meta charset="utf-8".
    <link href="style.css" rel="stylesheet" type="text/css">
    </head>

    <body>
    <nav>
        <div align="center">
          <ul>
            <li><a href="../index.html">Home</a></li>
            <li><a href="about us">AboutUs</a>
              <ul>
                <li><a href="policy">Policy</a></li>
                <li><a href="procedures">Procedures</a></li>
              </ul>
            </li>

            <li><a href="websites">Websites</a>
              <ul>
                <li><a href="templates">Templates</a></li>
                <li><a href="customized">Customized</a></li>
              </ul>
            </li>
            <li><a href="codes">Codes</a>
              <ul>
                <li><a href="html5">HTML5</a></li>
                <li><a href="css3">CSS3</a></li>
              </ul>
            </li>            
            <li><a href="contact us">Contact Us</a></li>
          </ul>
      </div>
    </nav>
    <div align="center"><img src="simple_img_2.jpg" width="970" height="450"></div>

    </body>
    </html>

CSS：

                    nav ul ul {
        display: none;
    }

        nav ul li:hover > ul {
            display: block;
        }

    nav ul {
        background: #efefef; 
        background: linear-gradient(top, #efefef 0%, #bbbbbb 100%);  
        background: -moz-linear-gradient(top, #efefef 0%, #bbbbbb 100%); 
        background: -webkit-linear-gradient(top, #efefef 0%,#bbbbbb 100%); 
        box-shadow: 0px 0px 9px rgba(0,0,0,0.15);
        padding: 0 20px;
        border-radius: 10px;  
        list-style: none;
        position: relative;
        display: inline-table;
    }
        nav ul:after {
            content: ""; clear: both; display: block;
        }
    nav ul li {
        float: left;
    }



        nav ul li:hover {
            background: #4b545f;
            background: linear-gradient(top, #4f5964 0%, #5f6975 40%);
            background: -moz-linear-gradient(top, #4f5964 0%, #5f6975 40%);
            background: -webkit-linear-gradient(top, #4f5964 0%,#5f6975 40%);
        }




            nav ul li:hover a {
                color: #fff;
            }




        nav ul li a {
            display: block; padding: 25px 40px;
            color: #757575; text-decoration: none;
        }



    nav ul ul {
        background: #5f6975; border-radius: 0px; padding: 0;
        position: absolute; top: 100%;
    }



        nav ul ul li {
            float: none; 
            border-top: 1px solid #6b727c;
            border-bottom: 1px solid #575f6a;
            position: relative;
        }




            nav ul ul li a {
                padding: 15px 40px;
                color: #fff;
            }   
                nav ul ul li a:hover {
                    background: #4b545f;
                }
4

1 回答 1

1 
  <div align="center">
      <ul>
        <li><a href="../index.html">Home</a></li>
        <li><a href="../aboutus.html">AboutUs</a>
          <ul>
            <li><a href="../policy.html">Policy</a></li>
            <li><a href="../procedures.html">Procedures</a></li>
          </ul>
        </li>

        <li><a href="../websites.html">Websites</a>
          <ul>
            <li><a href="../templates.html">Templates</a></li>
            <li><a href="../customized.html">Customized</a></li>
          </ul>
        </li>
        <li><a href="../codes.html">Codes</a>
          <ul>
            <li><a href="../html5.html">HTML5</a></li>
            <li><a href="../css3.html">CSS3</a></li>
          </ul>
        </li>            
        <li><a href="../contactus.html">Contact Us</a></li>
      </ul>
  </div>

我想你忘记了除 index.html 之外的所有链接的扩展文件。它应该是“policy.html”或类似的东西，并且它必须存在（这意味着您已经创建了这些文件）。

于 2013-09-23T10:44:27.447 回答