Question

我在尝试设置伪:after的css属性时在Chrome和资源管理器中收到以下错误。 （我正在尝试设置汉堡导航图标并设置样式）

我收到错误：

'未知属性名称'

当我设置伪width的{{1}}，height，background等时，

。这是在Chrome中：

给我错误的代码：

:after

完整的HTML代码

nav a#pull:after {
 content:"";
 background: url('nav-icon.png') no-repeat;
 width: 30px;
 height: 30px;
 display: inline-block;
 position: absolute;
 right: 15px;
 top: 10px;

完整的CSS代码

<html>
  <head>
    <title>Delivery Motion!</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <link rel="stylesheet" type="text/css" href="css/style.css">
    <script src="js/jquery-3.0.0.min.js"></script>
    <script>

    window.onload = function() {
    if (window.jQuery) {
        // jQuery is loaded
        alert("Yeah!");
    } else {
        // jQuery is not loaded
        alert("Doesn't Work");
    }
}
    // Grab the pull (extra menu icon) div and when clicked event handler will bring menu (the old actual menu).
    $(function() {
      var pull        = $('#pull');
      menu        = $('nav ul');
      menuHeight  = menu.height();

      $(pull).on('click', function(e) {
        e.preventDefault();
        menu.slideToggle();
      });
    });
// if the window is resized greater than 320px remove the display none attribute from the menu (actual older menu).
    $(window).resize(function(){
      var w = $(window).width();
      if(w > 320 && menu.is(':hidden')) {
          menu.removeAttr('style');
        }
    });
    </script>


   </head>
   <body>
     <nav class="clearfix">
       <ul class="clearfix">
          <li><a href="#">Home</a></li>
          <li><a href="#">How-to</a></li>
          <li><a href="#">Icons</a></li>
          <li><a href="#">Design</a></li>
          <li><a href="#">Web 2.0</a></li>
          <li><a href="#">Tools</a></li>
        </ul>
        <a href="#" id="pull">Menu</a>
      </nav>
   </body>
</html>

有什么想法吗？

Answer 1

在Chrome控制台中，您可以看到在最后几个属性之前有4个明显错误编码的字符。它与4个空格缩进匹配。可能有一些异国情调的字符显示为CSS文件中的空格，当您将代码粘贴到此处时，它们无法显示。

您可以简单地尝试删除这些属性前面的缩进空格，看看它是否有效吗？

Answer 2

在这个示例中，它似乎完全是代码的副本。我知道这是一个很长的镜头，但是如果它有隐藏的字符或者重新启动浏览器，可能会重新输入你的url（）。经过几个小时的控制台工作后，我有时需要重启chrome。

＆＃13;

window.onload = function() {
        if (window.jQuery) {
          // jQuery is loaded
          alert("Yeah!");
        } else {
          // jQuery is not loaded
          alert("Doesn't Work");
        }
      }
      // Grab the pull (extra menu icon) div and when clicked event handler will bring menu (the old actual menu).
    $(function() {
      var pull = $('#pull');
      menu = $('nav ul');
      menuHeight = menu.height();

      $(pull).on('click', function(e) {
        e.preventDefault();
        menu.slideToggle();
      });
    });
     // if the window is resized greater than 320px remove the display none attribute from the menu (actual older menu).
    $(window).resize(function() {
      var w = $(window).width();
      if (w > 320 && menu.is(':hidden')) {
        menu.removeAttr('style');
      }
    });

＆＃13;

* {
  margin: 0%;
}
body {
  background-color: #ece8e5;
}
nav {
  height: 40px;
  width: 100%;
  background: #455868;
  font-size: 11pt;
  font-family: 'PT Sans', Arial, sans-serif;
  font-weight: bold;
  position: relative;
  border-bottom: 2px solid #283744;
}
nav ul {
  padding: 0;
  margin: 0 auto;
  width: 600px;
  height: 40px;
  border: 2px solid;
}
nav li {
  display: inline;
  float: left;
}
.clearfix:before,
.clearfix:after {
  content: " ";
  display: table;
}
.clearfix:after {
  clear: both;
}
.clearfix {
  *zoom: 1;
}
nav a {
  color: #fff;
  display: inline-block;
  width: 100px;
  text-align: center;
  text-decoration: none;
  line-height: 40px;
  text-shadow: 1px 1px 0px #283744;
}
nav li a {
  border-right: 1px solid #576979;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}
nav li:last-child a {
  border-right: 0;
}
/*the menu will have brighter color when it is in :hover or :active state*/

nav a:hover,
nav a:active {
  background-color: #8c99a4;
}
/*extra link will be hidden (for the desktop screen)*/

nav a#pull {
  display: none;
}
/*When the screen size is max 600px the nav ul width will be 50%*/

@media screen and (max-width: 600px) {
  nav {
    height: auto;
  }
  nav ul {
    width: 100%;
    display: block;
    height: auto;
  }
  nav li {
    width: 50%;
    float: left;
    position: relative;
  }
  nav li a {
    border-bottom: 1px solid #576979;
    border-right: 1px solid #576979;
  }
  nav a {
    text-align: left;
    width: 100%;
    text-indent: 25px;
  }
}
/*how the navigation is displayed when the screen get smaller by 480px or lower (so this is our second breakpoint)*/

@media only screen and (max-width: 480px) {
  nav {
    border-bottom: 0;
  }
  nav ul {
    display: none;
    height: auto;
  }
  nav a#pull {
    display: block;
    background-color: #283744;
    width: 100%;
    position: relative;
  }
  /* Psuedo code :after's width, height, display etc. doesn't work in browsers. showing error.*/
  nav a#pull:after {
    content: "";
    background: url('http://lorempixel.com/72/72/') no-repeat;
    width: 30px;
    height: 30px;
    display: inline-block;
    position: absolute;
    right: 15px;
    top: 10px;
  }
}
/*screen gets smaller by 320px and lower the menu will be displayed vertically top to bottom.*/

*/@media only screen and (max-width: 320px) {
  nav li {
    display: block;
    float: none;
    width: 100%;
  }
  nav li a {
    border-bottom: 1px solid #576979;
  }
}

＆＃13;

<nav class="clearfix">
  <ul class="clearfix">
    <li><a href="#">Home</a>
    </li>
    <li><a href="#">How-to</a>
    </li>
    <li><a href="#">Icons</a>
    </li>
    <li><a href="#">Design</a>
    </li>
    <li><a href="#">Web 2.0</a>
    </li>
    <li><a href="#">Tools</a>
    </li>
  </ul>
  <a href="#" id="pull">Menu</a>
</nav>

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>

＆＃13;

浏览器中的CSS错误：使用伪：之后的'未知属性名'

2 个答案: