官术网_书友最值得收藏!

Creating an app

For now, we don't have any Vue app running on our web page. The whole library is based on Vue instances, which are the mediators between your View and your data. So, we need to create a new Vue instance to start our app:

// New Vue instance
var app = new Vue({
// CSS selector of the root DOM element
el: '#root',
// Some data
data () {
return {
message: 'Hello Vue.js!',
}
},
})

The Vue constructor is called with the new keyword to create a new instance. It has one argument--the option object. It can have multiple attributes (called options), which we will discover progressively in the following chapters. For now, we are using only two of them.

With the el option, we tell Vue where to add (or "mount") the instance on our web page using a CSS selector. In the example, our instance will use the <p id="root"> DOM element as its root element. We could also use the $mount method of the Vue instance instead of the el option:

var app = new Vue({
data () {
return {
message: 'Hello Vue.js!',
}
},
})
// We add the instance to the page
app.$mount('#root')

Most of the special methods and attributes of a Vue instance start with a dollar character.

We will also initialize some data in the data option with a message property that contains a string. Now the Vue app is running, but it doesn't do much, yet.

You can add as many Vue apps as you like on a single web page. Just create a new Vue instance for each of them and mount them on different DOM elements. This comes in handy when you want to integrate Vue in an existing project.

主站蜘蛛池模板: 济宁市| 乡城县| 西宁市| 夹江县| 天峻县| 惠东县| 济南市| 合山市| 蒙城县| 宜都市| 葵青区| 庆云县| 资兴市| 平乐县| 奉贤区| 满城县| 天水市| 梁山县| 沽源县| 武强县| 灵宝市| 定西市| 乌兰浩特市| 高阳县| 磐安县| 墨脱县| 宁夏| 奈曼旗| 陇川县| 普兰店市| 蒙阴县| 清徐县| 富源县| 东至县| 通渭县| 宁乡县| 枞阳县| 额济纳旗| 博野县| 长宁县| 雅安市|