basic introduction of
*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
{"metaMigratedAt":"2023-06-15T16:32:30.263Z","metaMigratedFrom":"YAML","title":"vue introduction","breaks":true,"slideOptions":"{\"theme\":\"solarized\",\"transition\":\"slide\"}","contributors":"[{\"id\":\"156b7bd7-bc36-4924-b2f2-88f18442b450\",\"add\":6435,\"del\":538}]"}