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CSS样式未应用

[英]CSS styles does not get applied

我想为表格的第一行应用背景色。 我给该行加了一个特殊的类名。 我还想为表的其余行应用其他颜色。 行颜色不会被应用。

 .table { font-family: sans-serif; width: auto; overflow: auto; display: block; border: 1; } /*I want the row with class head to be this color*/ .head { background-color: yellow; } /*I want the rest of the table rows this color*/ .table td { background-color: lightblue; } 
 <html> <head> <link rel="stylesheet" type="text/css" href="new-style.css"> <meta charset="UTF-8"> </head> <body id="body"> <table align='center' cellspacing=0 cellpadding=1 id="table" border=1 class="table"> <tr id="head" class="head"> <td class="head">Name</td> <td class="head">Type</td> </tr> <tr id="initial-row"> <td width=200> text here</td> <td width=200> text here </td> </tr> <tr id="second-row"> <td width=200> text here </td> <td width=200>text here </td> </tr> </table> </body> </html> 

您的问题在于特异性和顺序-因为您将浅蓝色放在td ,所以您也需要用黄色在td上覆盖它。

然后,您需要将黄色声明移到初始声明下方,因为它具有相同的特异性-这意味着语句的顺序很重要。

最后一件事-从表中删除display:block ,否则将破坏表的布局。

 .table { font-family: sans-serif; width: auto; overflow: auto; border: 1; width:100%; /* remove display block from here otherwise your table layout will break */ } /*put this first*/ .table td { background-color: lightblue; } /*override with this*/ .head td { background-color: yellow; } 
 <html> <head> <link rel="stylesheet" type="text/css" href="new-style.css"> <meta charset="UTF-8"> </head> <body id="body"> <table align='center' cellspacing=0 cellpadding=1 id="table" border=1 class="table"> <tr id="head" class="head"> <td class="head">Name</td> <td class="head">Type</td> </tr> <tr id="initial-row"> <td width=200> text here</td> <td width=200> text here </td> </tr> <tr id="second-row"> <td width=200> text here </td> <td width=200>text here </td> </tr> </table> </body> </html> 

有关CSS特异性的更多信息

Pete着迷的是 ,我想说的是,如果您想创建一个表头以使用正确的标签<th>

<tr>
  <th class="head">Name</th>
  <th class="head">Type</th>
</tr>

<th>标记定义HTML表中的标题单元格。

HTML表具有两种单元格:

  • 标题单元格-包含标题信息(使用元素创建)

  • 标准单元格-包含数据(使用元素创建)元素中的文本默认为粗体并居中。

 .table { font-family: sans-serif; width: auto; overflow: auto; display: block; border: 1; } /*I want the row with class head to be this color*/ th { background-color: yellow; } /*I want the rest of the table rows this color*/ .table td { background-color: lightblue; } 
 <html> <head> <link rel="stylesheet" type="text/css" href="new-style.css"> <meta charset="UTF-8"> </head> <body id="body"> <table align='center' cellspacing=0 cellpadding=1 id="table" border=1 class="table"> <tr id="head" class="head"> <th class="head">Name</th> <th class="head">Type</th> </tr> <tr id="initial-row"> <td width=200> text here</td> <td width=200> text here </td> </tr> <tr id="second-row"> <td width=200> text here </td> <td width=200>text here </td> </tr> </table> </body> </html> 

一个解决方案是增加的特异性为CSS设置的.head

 .table { font-family: sans-serif; width: auto; overflow: auto; display: block; border: 1; } /*I want the row with class head to be this color*/ .table .head { background-color: yellow; } /*I want the rest of the table rows this color*/ .table td { background-color: lightblue; } 
 <html> <head> <link rel="stylesheet" type="text/css" href="new-style.css"> <meta charset="UTF-8"> </head> <body id="body"> <table align='center' cellspacing=0 cellpadding=1 id="table" border=1 class="table"> <tr id="head" class="head"> <td class="head">Name</td> <td class="head">Type</td> </tr> <tr id="initial-row"> <td width=200> text here</td> <td width=200 > text here </td> </tr> <tr id="second-row"> <td width=200 > text here </td> <td width=200 >text here </td> </tr> </table> </body> </html> 

顺便说一句,我刚刚注意到您将table用作类,也许您应该使用其他名称...更具体

删除tr的类head ,然后添加!important 由于某些原因,即使我重新排列了CSS,颜色也不会没有!important改变

 .table { font-family: sans-serif; width: auto; overflow: auto; display: block; border: 1; } /*I want the row with class head to be this color*/ .head { background-color: yellow !important; } /*I want the rest of the table rows this color*/ .table td { background-color: lightblue; } 
 <body id="body"> <table align='center' cellspacing=0 cellpadding=1 id="table" border=1 class="table"> <tr id="head"> <td class="head">Name</td> <td class="head">Type</td> </tr> <tr id="initial-row"> <td width=200> text here</td> <td width=200> text here </td> </tr> <tr id="second-row"> <td width=200> text here </td> <td width=200>text here </td> </tr> </table> </body> 

<tr id="head" class="head">
    <th class="head">Name</td> <!-- change to th (table heading) -->
    <th class="head">Type</td>
</tr>

CSS:

th{
    background-color: yellow;
}

如@Pete所述,您的特异性不正确。 附带一提,您可以改进HTML标记以同时使用<thead> ,然后CSS可以仅将<thead>内的<thead> <th>元素作为目标。 这对于可访问性更好,因为它明确将“ head”定义为表头。

查看<table>标记上的w3c文档以获取可访问性@ https://www.w3.org/WAI/tutorials/tables/或有关该标记的一般信息,请查看惊人的Mozilla文档@ https:// developer .mozilla.org / en / docs / Web / HTML / Element / table

像这样:

.table {
  font-family: sans-serif;
  width: auto;
  overflow: auto;
  display: block;
  border: 1;
}


/*I want the row with class head to be this color*/

thead th {
  background-color: yellow;
}


/*I want the rest of the table rows this color*/

tbody td {
  background-color: lightblue;
}
<html>

  <head>
    <link rel="stylesheet" type="text/css" href="new-style.css">
    <meta charset="UTF-8">
  </head>

  <body id="body">
    <table align='center' cellspacing=0 cellpadding=1 id="table" border=1 class="table">
      <thead>
        <tr id="head">
          <th>Name</td>
          <th>Type</td>
        </tr>
      </thead>
      <tbody>
        <tr class="initial-row">
          <td>Text here</td>
          <td>Text here</td>
        </tr>
        <tr class="second-row">
          <td>Text here</td>
          <td>Text here</td>
        </tr>
      </tbody>
    </table>
  </body>

</html>
/*I want the rest of the table rows this color*/

.table tr {
  background-color: lightblue;
}


/*I want the row with class head to be this color*/

.head {
  background-color: yellow;
}

我认为应该是上面的代码。

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