CSS样式-选择器扩展

关系选择符

 

 

 用法：

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style type="text/css">
        #container>li>.a {
            width: 100px;
            height: 100px;
            background-color: #f00;
        }
/*将紧贴在.a后面的div元素选择出来*/
  #container>li>.a+div {
            width: 100px;
            height: 100px;
            background-color: #0f0;
        }
　　/*选择.a元素所有的兄弟元素*/
.a~p {
            width: 100px;
            height: 100px;
            background-color: #00f;
        }
    </style>
</head>
<body>
   <ul id="container">
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
   </ul>
</body>
</html>

 

 

 属性选择符：

 

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style type="text/css">
        #container>li>.a {
            width: 100px;
            height: 100px;
            background-color: #f00;
        }

        #container>li>.a+div {
            width: 100px;
            height: 100px;
            background-color: #0f0;
        }

        .a~p {
            width: 100px;
            height: 100px;
            background-color: #00f;
        }
/*选择具有class属性的元素*/
div[class] {
            width: 100px;
            height: 100px;
            background-color: #000!important;
        }
    </style>
</head>
<body>
   <ul id="container">
        <li>
            <div class="a"></div>
            <div class="a5"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
   </ul>
</body>
</html>

 

<!DOCTYPE html>

<html lang="en">

<head>

    <title>Document</title>

    <style type="text/css">

        #container>li>.a {

            width: 100px;

            height: 100px;

            background-color: #f00;

        }

 

        #container>li>.a+div {

            width: 100px;

            height: 100px;

            background-color: #0f0;

        }

 

        .a~p {

            width: 100px;

            height: 100px;

            background-color: #00f;

        }

 

        div[class] {

            width: 100px;

            height: 100px;

            background-color: #000!important;

        }

　　/*选择具有class属性且属性值为一用空格分隔的字词列表，其中一个等于a5的元素。*/

        div[class~="a5"] {

            background-color: #ff0!important;

        }

    </style>

</head>

<body>

   <ul id="container">

        <li>

            <div class="a a5"></div>

            <div class="a5"></div>

            <div></div>

            <p></p>

        </li>

        <li>

            <div class="a"></div>

            <div></div>

            <p></p>

        </li>

        <li>

            <div class="a"></div>

            <div></div>

            <p></p>

        </li>

        <li>

            <div class="a"></div>

            <div></div>

            <p></p>

        </li>

        <li>

            <div class="a"></div>

            <div></div>

            <p></p>

        </li>

        <li>

            <div class="a"></div>

            <div></div>

            <p></p>

        </li>

   </ul>

</body>

</html>

 

伪类选择符：

 

 

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Document</title>
    <style type="text/css">
        #container>li>.a {
            width: 100px;
            height: 100px;
            background-color: #f00;
        }

        #container>li>.a+div {
            width: 100px;
            height: 100px;
            background-color: #0f0;
        }

        .a~p {
            width: 100px;
            height: 100px;
            background-color: #00f;
        }

        div[class] {
            width: 100px;
            height: 100px;
            background-color: #000!important;
        }

        div[class~="a5"] {
            background-color: #ff0!important;
        }

        #container>li>p:nth-of-type(1) {
            background-color: #000!important;
        }
    </style>
</head>
<body>
   <ul id="container">
        <li>
            <div class="a a5"></div>
            <div class="a5"></div>
            <div></div>
            <p></p>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
        <li>
            <div class="a"></div>
            <div></div>
            <p></p>
        </li>
   </ul>
</body>
</html>

 

 

posted @ 2021-04-09 22:56  #Friday  阅读(87)  评论(0)    收藏  举报