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。
HTML uses a hyperlink to connect to another document on the network. Links can be found in almost all web pages. Click the link to jump from one page to another. HTML uses the label < a > to set hypertext links. A hyperlink can be a word, a word, or a group of words, or an image that youcan click to jump to a new document or a part of the current document. When you move the mouse pointer over a link in a web page, the arrow changesto a small hand. The href attribute is used in the tag < a > to describe the address of the link. By default, the link appears in the browser in the following form: An unvisited link is displayed in blue font and underlined. Visited links are displayed in purple and underlined. When you click the link, the link appears red and underlined. Note: if the CSS style is set for these hyperlinks, the display style will be displayed according to the settings of CSS. The linked HTML code is simple. It looks like this: Clicking this hyperlink will take the user to the home page of the rookie tutorial. Tip: “linked text” does not have to be text. Pictures or other HTML elements can be links. Use The following line opens the document in a new window: Tip: bookmarks are not displayed in any special way, that is, they are not displayed on the HTML page, so they are hidden from the reader. Insert ID into the HTML document: Create a link to the “useful hint section (id=” tips “)” in the HTML document: Alternatively, create a link from another page to the “useful hint section (id=” tips “): Note: always add a forward slash to the subfolder. If you write the link like this: href= “ https://www.runoob.com/html ”, two HTTP requests will be made to the server. This is because the server adds a forward slash to this address and creates a new request, like this: href= “ https://www.runoob.com/html/ ”. Label Description < a > Define a hyperlink 11.10.1. HTML hyperlinks ¶
11.10.2. HTML Link Syntax ¶
<a href="*url*">*Link Text* a>
href property describes the target of the link. . 11.10.3. Example ¶
<a href="https://www.runoob.com/">Visit the Rookie Tutoriala>
11.10.4. HTML Link-
target attribute ¶ target property, you can define where the linked document is displayed. 11.10.5. Example ¶
<ahref="https://www.runoob.com/"target="\_blank"rel="noopener noreferrer">Visit the Rookie Tutorial!
11.10.6. HTML Link-id attribute ¶
id property can be used to create a bookmark for an HTML document. 11.10.7. Example ¶
<a id="tips">Useful Tipsa>
<a href="#tips">Accessing useful tips sectiona>
<a href="https://www.runoob.com/html/html-links.html#tips"> Accessing useful tips sectiona>
11.10.8. Basic precautions-useful tips ¶
11.10.9. HTML Link label ¶