最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。
CSS3 can design text content in a multi-column layout like a newspaper, as shown in the following example:
This website introduces the basic knowledge of HTML, CSS, Javascript, Python,Java,Ruby,C,PHP, MySQL and other programming languages. At the same time, this site also provides a large number of online examples, through examples, you can better learn programming. The numbers in the table represent the version number of the first browser that supports the method. Immediately after the number. Attribute Column-count 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit- 11.1 Column-gap 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit- 11.1 Column-rule 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit- 11.1 Column-rule-color 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit 11.1 Column-rule-style 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit 11.1 Column-rule-width 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit 11.1 Column-width 4.0-webkit- 10.0 2.0 -moz- 3.1 -webkit- 15.0-webkit 11.1 In this section, we will learn about the following multi-column properties of CSS3: The following example will Example The following example specifies that the gap between columns is 40 pixels: Example Example Example Example The The following example sets the thickness, style, and color of the direct border of the column: Example The following example specifies Example The following table lists the multi-column properties of all CSS3: Attribute Description Column-count Specifies the number of columns that the element should be split into. Column-fill Specify how to populate the column Column-gap Specify the gap between columns Column-rule Abbreviations for all column-rule-* attributes Column-rule-color Specify the color of the border between the two columns Column-rule-style Specify the style of the border between the two columns Column-rule-width Specify the thickness of the border between the two columns Column-span Specify how many columns the element should span Column-width Specify the width of the column Columns Abbreviated properties of column-width and column-count. 8.14.1. Browser support ¶
-webkit- or -moz- specifies the prefix for the browser. 8.14.2. CSS3 multi-column properties ¶
column-count column-gap column-rule-style column-rule-width column-rule-color column-rule column-span column-width 8.14.3. CSS3 creates multiple columns ¶
column-count property specifies the number of columns to be split. div{ -webkit-column-count:3; /\* Chrome, Safari, Opera \*/ -moz-column-count:3; /\* Firefox \*/ column-count:3; }
8.14.4. The gap between columns in CSS3 multiple columns ¶
column-gap property specifies the gap between columns.div{ -webkit-column-gap:40px; /\* Chrome, Safari, Opera \*/ -moz-column-gap:40px; /\* Firefox \*/ column-gap:40px; }
8.14.5. CSS3 column border ¶
column-rule-style property specifies the border style between columns:div{ -webkit-column-rule-style:solid; /\* Chrome, Safari, Opera \*/ -moz-column-rule-style:solid; /\* Firefox \*/ column-rule-style:solid; }
column-rule-width property specifies the border thickness of two columns:div{ -webkit-column-rule-width:1px; /\* Chrome, Safari, Opera \*/ -moz-column-rule-width:1px; /\* Firefox \*/ column-rule-width:1px; }
column-rule-color property specifies the border color of two columns:div{ -webkit-column-rule-color:lightblue; /\* Chrome, Safari, Opera \*/ -moz-column-rule-color:lightblue; /\* Firefox \*/ column-rule-color:lightblue; }
column-rule property is column-rule-\* abbreviations for all attributes.div{ -webkit-column-rule:1px solid lightblue; /\* Chrome, Safari, Opera \*/ -moz-column-rule:1px solid lightblue; /\* Firefox \*/ column-rule:1px solid lightblue; }
8.14.6. Specify how many columns the element spans ¶
element spans all columns:
h2{ -webkit-column-span:all; /\* Chrome, Safari, Opera \*/ column-span:all; }
8.14.7. Specify the width of the column ¶
column-width property specifies the width of the column.Example ¶
div{ -webkit-column-width:100px; /\* Chrome, Safari, Opera \*/ column-width:100px; }
8.14.8. CSS3 multi-column properties ¶