CSS 指南

发布时间 :2023-12-25 23:00:03 UTC      

CSS - 层叠样式表(Cascading Style Sheets)

CSS定义如何显示HTML元素。

CSS 描述了HTML元素的可视化样式(外观,布局,颜色,字体)。

CSS是单独设计的文件(从而大大提高HTML的灵活性和减少HTML的复杂性)。

CSS简单易学。你可以把一个HTML元素当作选择器,并在大括号内的列出样式属性

CSS 实例

body
{
background-color:#d0e4fe;
}
h1
{
color:orange;
text-align:center;
}
p
{
font-family:"Times New Roman";
font-size:20px;
}

样式表极大地提高了工作效率

样式表定义如何显示 HTML 元素,诸如 HTML 3.2 的样式中的字体标签和颜色属性通常被保存在外部的 .css 文件中。

通过仅仅编辑一个简单的 CSS 文档,外部样式表使你有能力同时改变站点中所有页面布局的外观。

由于允许同时控制多重页面的样式和布局,CSS 可以称得上 WEB 设计领域的一个突破。作为网站开发者,你可以为每个 HTML 元素定义样式,并将之应用于你希望的任意多的页面中。如需进行全局变换,只需简单地改变样式,然后网站中的所有元素均会被自动地更新。

如何学习 CSS?

学习我们的 完整的 CSS 教程

学习我们的 完整的 CSS 参考手册

Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.