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。
At the beginning of learning Vue, we do not recommend using the vue-cli command-line tool to create projects. A simpler way is to directly introduce the vue.global.js file on the page to test the learning process.
The application in Vue3 is created by using the createApp function, with the following syntax format:
const app = Vue.createApp({ /* option */ }) The options passed to createApp are used to configure the root component. When using mount() to mount an application, this component is used as the starting point for rendering.
A simple example:
Vue.createApp(HelloVueApp).mount('#hello-vue') createApp is the root component (HelloVueApp), which is the starting point for rendering when the application is mounted.
An application needs to be mounted into a DOM element. The above code uses mount (’# hello-vue’) to apply the Vue HelloVueApp mount to < div id= “hello-vue” > < / div >.
Next, let’s start with Hello Vue!! start learning the code. 2.6.1. Vue 3.0 instance ¶