basic introduction of

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Benson

What is Vue.js?

NOTE:是一個用於建立使用者介面的開源JavaScript框架，也是一個建立單頁應用的Web應用框架。 2016年一項針對JavaScript的調查表明，Vue有著89%的開發者滿意度。在GitHub上，該專案平均每天能收穫95顆星，為Github有史以來星標數第3多的專案。

What is framework?

NOTE:把 Framework 比喻成樂高積木，他已經建構了大多數你會使用到的元件，甚至已經有良好的骨架，你只需要在它上頭建築你所需要的 Application(應用) ，Framework 幫你定義好大部分的結構，剩下的細節該如何客製化，該怎麼做動只需要依照你的需求去做修改與實現即可。

Types of Frameworks

  • Web Application Frameworks

  • DataScience Frameworks

  • Mobile Development Frameworks

Common web Application Frameworks

  • Angular

  • React

  • Vue

Why Vue.js?

  • The small size of the application.

  • Higher performance.

  • Learning Ease.

  • Improved Documentation.

  • Progressive.

  • …etc

NOTE:it still have a lot of advantage.

  • Very flexible.

Progressive?

NOTE:

Let's get starteDdddd!

under your home directory

mkdir vue-session

cd vue-session

touch myFirstVue.html

code .

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  </head>
  <body>
    <div id="app">{{ message }}</div>
    <script>
      var app = new Vue({
        el: "#app",
        data: {
          message: "Hello Vue!",
        },
      });
    </script>
  </body>
</html>

NOTE:describe the code

The data and the DOM are now linked, and everything is now reactive.

U can simply change the value by enter

app.message = "?"

in the browser’s JavaScript console & c what's the difference.

Directives are prefixed with v- to indicate that they are special attributes provided by Vue.

v-bind

keep this element’s attribute up-to-date with the property on the Vue instance.
NOTE:bind the directive with the value

<div id="app-2">
  <span v-bind:title="message">
    Hover your mouse over me for a few seconds
    to see my dynamically bound title!
  </span>
</div>

var app2 = new Vue({
  el: '#app-2',
  data: {
    message: 'You loaded this page on ' + new Date().toLocaleString()
  }
})

app2.message = 'some new message'

NOTE:what's the different between up 2.

v-if

<div id="app-3">
  <span v-if="seen">Now you see me</span>
</div>

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

app3.seen = false

v-for

<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' }
    ]
  }
})

app4.todos.push({ text: 'New item' })

Handling User Input

v-on

NOTE:To let users interact with your app, we can use the v-on directive to attach event listeners that invoke methods on our Vue instances:

<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('')
    }
  }
})

v-model

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

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

Try to type something in.

project time

STEP 1

use v-model to insert the memo

STEP 2

use v-for to do the list

STEP 3

use html button to add memo into list

STEP 4

use v-bind to bind the memo with color
NOTE:'color:red' `{}`

STEP 5

use v-model to insert the color

STEP 6

use html button to set the color and change the color

STEP 7

use v-if to show the list or hide the list

STEP 8

use the pop method to pop the memo u may misinsert

DONE

Composing with Components


NOTE:講解組件化可以不用讓東西一直重複使用等等，維護性高，一個壞就只會壞一個

// Define a new component called todo-item
Vue.component('todo-item', {
  template: '<li>This is a todo</li>'
})

var app = new Vue(...)

in template:

<ol>
  <!-- Create an instance of the todo-item component -->
  <todo-item></todo-item>
</ol>

use "prop" to pass data from parent scope into child components

in js:

Vue.component('todo-item', {
  props: ['todo'],
  template: '<li>{{ todo.text }}</li>'
})

var app7 = new Vue({
  el: '#app-7',
  data: {
    groceryList: [
      { id: 0, text: 'Vegetables' },
      { id: 1, text: 'Cheese' },
      { id: 2, text: 'Whatever else humans are supposed to eat' }
    ]
  }
})

in html:

<div id="app-7">
  <ol>
    <!--
      Now we provide each todo-item with the todo object
      it's representing, so that its content can be dynamic.
      We also need to provide each component with a "key",
      which will be explained later.
    -->
    <todo-item
      v-for="item in groceryList"
      v-bind:todo="item"
      v-bind:key="item.id"
    ></todo-item>
  </ol>
</div>

In most of the Vue.js project:

<div id="app">
  <app-nav></app-nav>
  <app-view>
    <app-sidebar></app-sidebar>
    <app-content></app-content>
  </app-view>
</div>

now , try to use component to rebuild the list :d

WTF.js
https://ithelp.ithome.com.tw/articles/10190873

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