13516821613 2021-07-20 03:36:55
css 小程序界面设计


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假设希望 h2 元素和段落都有灰色。为达到这个目的,最容易的做法是使用以下声明:

h2, p {color:gray;}

将 h2 和 p 选择器放在规则左边,然后用逗号分隔,就定义了一个规则。其右边的样式(color:gray;)将应用到这两个选择器所引用的元素。逗号告诉浏览器,规则中包含两个不同的选择器。如果没有这个逗号,那么规则的含义将完全不同。参见后代选择器。

body, h2, p, table, th, td, pre, strong, em {color:gray;}


/* no grouping */
h1 {color:blue;}
h2 {color:blue;}
h3 {color:blue;}
h4 {color:blue;}
h5 {color:blue;}
h6 {color:blue;}
/* grouping */
h1, h2, h3, h4, h5, h6 {color:blue;}


/* group 1 */
h1 {color:silver; background:white;}
h2 {color:silver; background:gray;}
h3 {color:white; background:gray;}
h4 {color:silver; background:white;}
b {color:gray; background:white;}
/* group 2 */
h1, h2, h4 {color:silver;}
h2, h3 {background:gray;}
h1, h4, b {background:white;}
h3 {color:white;}
b {color:gray;}
/* group 3 */
h1, h4 {color:silver; background:white;}
h2 {color:silver;}
h3 {color:white;}
h2, h3 {background:gray;}
b {color:gray; background:white;}

CSS2 引入了一种新的简单选择器 - 通配选择器(universal selector),显示为一个星号(*)。该选择器可以与任何元素匹配,就像是一个通配符。

* {color:red;}

这个声明等价于列出了文档中所有元素的一个分组选择器。利用通配选择器,只需敲一次键(仅一个星号)就能使文档中所有元素的 color 属性值指定为 red。
假设您希望所有 h1 元素都有红色背景,并使用 28 像素高的 Verdana 字体显示为蓝色文本,可以写以下样式:

h1 {font: 28px Verdana;}
h1 {color: blue;}
h1 {background: red;}


h1 {font: 28px Verdana; color: white; background: black;}

这与前面的 3 行样式表的效果完全相同。

h1 {
font: 28px Verdana;
color: blue;
background: red;



<label>姓名:</label><input type='text' placeholder='请输入文字'></input>



/* 元素选择器 */
background-color: gainsboro;
background-color: aliceblue;
color: red;



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