Home Web Front-end HTML Tutorial CSS基础学习四:元素选择器_html/css_WEB-ITnose

CSS基础学习四:元素选择器_html/css_WEB-ITnose

Jun 24, 2016 am 11:34 AM

        在上一篇的博客中我们已经熟悉CSS语法,对于CSS代码格式也有了一些认识。下面我就来说一下CSS代码式:

        选择器名称 { 属性名:属性值;属性名:属性值;......}

        属性与属性之间用分号隔开;属性与属性值直接使用冒号连接;如果一个属性有多个属性值的话,那么多个属性值用空格隔开。

       上述提到了我这一篇博客所要说的主题,就是选择器。选择器就是指定CSS语法要作用的标签,那个标签的名称

就是选择器。

       基本的选择器可分为三种:

        a)html标签名选择器:使用的是html的标签名,又叫元素选择器。

        b)class选择器;使用的是标签内的class属性,又叫类选择器。

        c)id选择器:使用的是标签内的id属性。

        每一个标签都定义了class属性和id属性,用于对标签进行标识,方便对标签进行操作。在定义中,多个标签的

class属性值可以相同,而id属性值必须唯一,因为JavaScript中经常使用。

         一CSS元素选择器

        最常见的 CSS 选择器是元素选择器。换句话说,文档的元素就是最基本的选择器。如果设置 HTML 的样式,选

择器通常将是某个 HTML 元素,比如 p、h1、em、a,甚至可以是 html 本身。

       下面举个最简单的例子:

<span style="font-size:18px;"><meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>CSS</title></span>
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