Vue entry (a)

1-1 Installation Tools

It must first of its profits, while using Vue, recommended to install on the browser  Vue Devtools . You can better debug Vue applications.

vue can directly reference the latest version <script src="https://cdn.jsdelivr.net/npm/vue"></script>
can be downloaded to the local vue.js
#### 1-2hello world
of international conventions first to a hello world  source

    <div id="app">{{message}}</div> 

        var app = new Vue({
            el: '#app',
            data:{
                message:'hello Vue!'
            }
        })      

Examples of objects comprising three parts

• Examples of objects vue: new Vue
• el: element needs to be acquired element is always the root of the container element html
• data: for storing data, an object is, various data can be stored inside
  #### 1-3 binding (v-bind)
  the text except as interpolation hello world, we can also be such binding element characteristics Source

    <div id="app-2">
        <span v-bind:title="message">
           鼠标悬停几秒钟查看此处动态绑定的提示信息！    
        </span>
    </div>      

    var app2 = new Vue({
            el:'#app-2',
            data:{
                message: '页面加载于' + new Date().toLocaleString()
            }
        })

#### 1-4 cycle conditions (v-if v-for)
source

<div id="app-3">
  <p v-if="seen">现在你看到我了</p>
</div>

var app3 = new Vue({
  el: '#app-3',
  data: {
    seen: true
  }
})

In the console input app3.seen = falsebefore displaying the message will disappear, and this shows that we not only can bind data to text or DOM feature can also be bound to the DOM structure
Source

<div id="app-4">
  <ol>
    <li v-for="todo in todos">
      {{ todo.text }}
    </li>
  </ol>
</div>

var app4 = new Vue({
  el: '#app-4',
  data: {
    todos: [
      { text: 'Learn JavaScript' },
      { text: 'Learn Vue' },
      { text: 'Build something awesome' }
    ]
  }
})

In the console, enter the app4.todos.push({ text: 'new item' })table and finally add a.
#### 1-5 event binding (v-on) and two-way data binding (v-model)
source

<div id="app-5">
  <p>{{ message }}</p>
  <button v-on:click="reverseMessage">Reverse Message</button>
</div>

var app5 = new Vue({
  el: '#app-5',
  data: {
    message: 'Hello Vue.js!'
  },
  methods: {
    reverseMessage: function () {
      this.message = this.message.split('').reverse().join('')
    }
  }
})

In reverseMessage method, we updated the status of the application, but did not touch DOM-- all DOM manipulation by Vue to deal with, our code can only be concerned with logic level

Vue also offers a v-model instruction, it can easily form a two-way binding between input and application state. Source

<div id="app-6">
  <p>{{ message }}</p>
  <input v-model="message">
</div>

var app6 = new Vue({
  el: '#app-6',
  data: {
    message: 'Hello Vue!'
  }
})