第一章：3小时Vue基础快速入门
1、vue的起步和插值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>vue的起步和插值</title>
</head>
<body>
<div id="app">
<h2>{{ msg }}</h2> <!--插值表达式，里面可以插任意的值。这里插入了变量。-->
<h3>{{ 2 }}</h3> <!--插入数值-->
<h3>{{ "hello" }}</h3> <!--插入字符串-->
<h3>{{ {id:1} }}</h3> <!--插入对象-->
<h3>{{ 1>2 ? '真的':'假的'}}</h3> <!-- 插入表达式 -->
<h3>{{ txt.split('').reverse().join('') }}</h3> <!--插入了运算的结果。 排序反转。 -->
<h3></h3>
<h1>{{ getContent() }}</h1>
<h1>{{ msg3 }}</h1>
</div>
<!-- 1.引包 -->
<script src="./vue.js"></script>
<script>
// console.log(Vue);
// 2.初始化
const vm = new Vue({
el: '#app',
// 数据属性
data: {
msg: 'hello vue',
txt: 'hello',
msg2: 'content',
msg3:'<p>插值语法</p>'
},
// 存放的是方法
methods: {
getContent() {
return this.msg + ' ' + this.msg2;
}
}
});
console.log(vm.msg);
</script>
</body>
</html>
2、指令之v-text和v-html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>指令之v-text和v-html</title>
</head>
<body>
<div id='app'>
<h1>{{ msg }}</h1>
<h2 v-text='msg'></h2>
<div v-html='htmlMsg'></div>
</div>
<script src="./vue.js"></script>
<script>
// {{}}和v-text的作用是一样的 都是插入值 直接渲染 像css中的innerText
// v-html既能插入值 又能插入标签 像css中的innerHTML
new Vue({
el:'#app',
data:{
msg:"插入标签",
htmlMsg:'<h3>小马哥</h3>'
}
})
</script>
</body>
</html>
3、条件渲染 v-if 和 v-show
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>条件渲染</title>
</head>
<body>
<div id='app'>
<div v-if = "isShow">
显示
</div>
<div v-else>
隐藏
</div>
<h3 v-show = 'show'>小马哥</h3>
</div>
<script src="./vue.js"></script>
<script>
// v-if v-else-if v-else v-show
// v-if 和 v-show 具有同样的作用，只是渲染时间不一样。前者执行对应的条件的时候才渲染，后者页面加载的时候就渲染。
new Vue({
el: '#app',
data: {
isShow:Math.random() > 0.5, //条件判断随时数大于0.5显示，小于则隐藏。
show:true
}
})
</script>
</body>
</html>
4、v-bind 绑定 用于绑定数据和元素属性 简写： ：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>v-bind指令</title>
<style>
.active{
color: red;
}
</style>
</head>
<body>
<div id='app'>
<a v-bind:href = 'res.url' v-bind:title='res.title'>{{res.name}}</a>
<img :src="imgSrc" alt=""> <!-- :src是v-bind:src的简写方式。-->
<h3 class='name' :class = "{active:isActive}">v-bind的用法</h3>
<!--isActive值是true则执行.active即字体红色，若值是false则不执行.active，字体默认黑色。-->
<!-- <h4 :aaa = 'res.name'></h4> -->
<h4 :style='{color:isColor, fontSize:fontSize+"px"}'>hello bind</h4> <!--通过Vue框架h4标签渲染字体颜色和字体大小。-->
</div>
<script src="./vue.js"></script>
<script>
new Vue({
el: '#app',
data: {
res:{
name:'百度',
url:'https://www.baidu.com',
title:'百度一下'
},
imgSrc:'./images/logo.png',
isActive:true,
isColor:'green',
fontSize:30
}
})
</script>
</body>
</html>
5、v-on事件绑定 简写：@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>v-on事件绑定</title>
<style>
.box{
width: 200px;
height: 200px;
background-color: red;
}
.active{
background-color: green;
}
</style>
</head>
<body>
<div id='app'>
<h3>{{num}}</h3>
<button v-on:click.once="handleClick">+1</button>
<div class='box' :class='{active:isActive}'></div>
<button @click='changeClick'>切换</button>
<!-- @click是v-on:click的简化。 -->
<input v-on:keyup.up="submit">
</div>
<script src="./vue.js"></script>
<script>
/*
1.扫一眼 HTML 模板便能轻松定位在 JavaScript 代码里对应的方法。
2.因为你无须在 JavaScript 里手动绑定事件，你的 ViewModel 代码可以是非常纯粹的逻辑，和 DOM 完全解耦，更易于测试。
3.当一个 ViewModel 被销毁时，所有的事件处理器都会自动被删除。你无须担心如何清理它们。
*/
new Vue({
el: '#app',
data: {
num:0,
isActive:false
},
methods: {
handleClick(){
this.num+=1;
},
changeClick(){
this.isActive = !this.isActive; //布尔条件判断，取反。
},
submit(){
alert(1);
}
},
})
</script>
</body>
</html>
6、v-for列表渲染
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>v-for列表渲染</title>
<style>
.box {
width: 200px;
height: 200px;
background-color: red;
}
.active {
background-color: green;
}
</style>
</head>
<body>
<div id='app'>
<div>
<ul>
<li v-for = '(item,index) in menus' :key = 'item.id'>
<!--使用v-for的时候，记得后面要加上:key，否则遍历会出问题。-->
<h3>{{index}} - id:{{item.id}} 菜名:{{item.name}}</h3>
</li>
</ul>
<ol>
<li v-for = "(val,key) in obj" :key='key'>
{{key}}---{{val}}
</li>
</ol>
</div>
</div>
<script src="./vue.js"></script>
<script>
new Vue({
el: '#app',
data: {
menus:[
{id:1,name:'大腰子'},
{id:2,name:'烤鸡翅'},
{id:3,name:'烤韭菜'},
{id:4,name:'烤大蒜'},
],
obj:{
title:'hello 循环',
author:'小马哥'
}
},
methods: {
},
})
</script>
</body>
</html>
7、vue 中v-model双向数据绑定 表单输入绑定
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>vue的双向数据绑定v-model</title>
<style>
</style>
</head>
<body>
<div id='app'>
<p>{{msg}}</p>
<input type="text" v-model='msg'>
<!-- 复选框单选 -->
<label for="checkbox">{{checked}}</label>
<input type="checkbox" id='checkbox' v-model='checked'>
<div class="box">
<label for="a">黄瓜</label>
<input type="checkbox" id='a' value='黄瓜' v-model='checkedNames'>
<label for="b">西红柿</label>
<input type="checkbox" id='b' value='西红柿' v-model='checkedNames'>
<label for="c">芸豆</label>
<input type="checkbox" id='c' value='芸豆' v-model='checkedNames'>
<br />
<span>{{checkedNames}}</span>
</div>
<label>{{txt}}</label>
<input v-model.lazy="txt">
<label>{{msg2}}</label>
<input v-model.trim="msg2">
</div>
<script src="./vue.js"></script>
<script>
new Vue({
el: '#app',
data: {
msg: '小马哥',
msg2: '',
txt: '',
checked: false,
checkedNames: []
},
methods: {
},
})
</script>
</body>
</html>
<!-- 下面在单独给大家介绍下vue中v-model使用
v-model用于表单数据的双向绑定，其实它就是一个语法糖，这个背后就做了两个操作：
1. v-bind绑定一个value属性
2. v-on指令给当前元素绑定input事件
自定义组件使用v-model，应该有以下操作：
1. 接收一个value prop
2. 触发input事件，并传入新值 -->
8、侦听器watch的用法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>侦听器watch</title>
</head>
<body>
<div id="app">
<input type="text" v-model="msg">
<h3>{{msg}}</h3>
<h3>{{stus[0].name}}</h3>
<button @click='stus[0].name = "Tom"'>改变</button>
</div>
<script src="./vue.js"></script>
<script>
// 基本的数据类型可以使用watch直接监听，复杂数据类型Object Array 要深度监视
new Vue({
el: '#app',
data: {
msg:'',
stus:[{name:'jack'}]
},
watch: {
// key是属于data对象的属性名 value:监视后的行为 newV :新值 oldV:旧值
'msg':function(newV,oldV){
// console.log(newV,oldV);
if(newV === '100'){
console.log('hello');
}
},
// 深度监视： Object对象 |Array数组
"stus":{
deep:'true',//表示深度监视
handler:function(newV,oldV){
console.log(newV[0].name);
}
}
},
})
</script>
</body>
</html>
9、计算属性之computed
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>侦听器watch</title>
</head>
<body>
<div id='app'>
{{reverseMsg}}
<h3>{{fullName}}</h3>
<button @click='handleClick'>改变</button>
</div>
<script src="./vue.js"></script>
<script>
new Vue({
el: '#app',
data: {
msg: 'hello world',
firstName: '小马',
lastName: '哥'
},
methods: {
handleClick(){
this.msg = '计算属性computed';
this.lastName = '妹';
}
},
computed: {
// computed默认只有getter方法
// 计算属性最大的优点：产生缓存 如果数据没有发生变化 直接从缓存中取
reverseMsg: function () {
return this.msg.split('').reverse().join('')
},
fullName: function () {
return this.firstName + this.lastName;
}
},
})
</script>
</body>
</html>
10、计算属性之computed的setter方法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>计算属性setter</title>
</head>
<body>
<div id='app'>
{{content}}
<input type="text" v-model='content' @input = 'handleInput'>
<button @click='handleClick'>获取</button>
</div>
<script src="./vue.js"></script>
<script>
new Vue({
el: '#app',
data: {
msg: '',
},
methods: {
handleInput:function(event){
const {value} = event.target;
this.content = value;
},
handleClick(){
// console.log();
if (this.content) {
console.log(this.content);
}
}
},
computed: {
content:{
set:function(newV){
this.msg = newV;
},
get:function(){
return this.msg;
}
}
},
})
</script>
</body>
</html>
11、Vue的过滤器 filters 讲解 全局过滤器 局部过滤器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>过滤器</title>
</head>
<body>
<div id="app">
<h3>{{price | myPrice('¥')}}</h3>
<h3>{{msg|myReverse}}</h3>
</div>
<script src="./vue.js"></script>
<script>
// 创建全局过滤器
Vue.filter('myReverse', (val) => {
return val.split('').reverse().join('');
})
// 为数据添油加醋
// ¥ $20
new Vue({
el: '#app',
data: {
price: 10,
msg:'hello 过滤器'
},
// 局部过滤器
filters: {
myPrice: function (price, a) {
return a + price;
}
}
})
</script>
</body>
</html>
12、案例：音乐播放器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>案例:音乐播放器</title>
<style>
* {
padding: 0;
margin: 0;
}
ul {
list-style: none;
}
ul li {
margin: 20px 20px;
padding: 10px 5px;
border-radius: 3px;
}
ul li.active {
background-color: #D2E2F3;
border-radius: 10px;
border: 2px solid #3684d8;
}
#app{
width: 500px;
border: 2px solid #e26fc5;
border-radius: 20px;
padding: 20px;
margin: 50px auto;
background-color: rgb(227, 233, 139);
}
</style>
</head>
<body>
<div id='app'>
<audio :src="currentSrc" controls autoplay @ended='handleEnded'></audio>
<ul>
<li :class='{active:index===currentIndex}' v-for='(item,index) in musicData' :key='item.id'
@click='handleClick(item.songSrc,index)'>
<h2>{{item.id}}-歌名: {{item.name}}</h2>
<p>歌手: {{item.author}}</p>
</li>
</ul>
<button @click='handleNext'>下一首</button>
</div>
<script src="./vue.js"></script>
<script>
const musicData = [{
id: 1,
name: '于荣光 - 少林英雄',
author: '于荣光',
songSrc: './static/于荣光 - 少林英雄.mp3'
},
{
id: 2,
name: 'Joel Adams - Please Dont Go',
author: 'Joel Adams',
songSrc: './static/Joel Adams - Please Dont Go.mp3'
},
{
id: 3,
name: 'MKJ - Time',
author: 'MKJ',
songSrc: './static/MKJ - Time.mp3'
},
{
id: 4,
name: 'Russ - Psycho (Pt. 2)',
author: 'Russ',
songSrc: './static/Russ - Psycho (Pt. 2).mp3'
}
];
new Vue({
el: '#app',
data: { //此处是data，不是date
musicData,
currentSrc: './static/于荣光 - 少林英雄.mp3',
currentIndex: 0
},
methods: { //此处是方法里面添加事件函数
handleClick(src, index) {
this.currentSrc = src;
this.currentIndex = index;
},
handleEnded() {
// // 下一首的播放
// this.currentIndex++;
// this.currentSrc = this.musicData[this.currentIndex].songSrc;
this.handleNext(); //此处的this千万不能忘了。
},
handleNext() {
this.currentIndex++;
if (this.currentIndex === this.musicData.length) {
this.currentIndex = 0;
}
this.currentSrc = this.musicData[this.currentIndex].songSrc
}
}
})
</script>
</body>
</html>
13、音乐播放器
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
ul{
list-style: none;
}
#app{
width: 500px;
border: 2px solid rgb(55, 79, 143);
padding: 30px;
margin: 50px auto;
border-radius: 20px;
background-color: rgb(209, 238, 105);
}
#app ul li{
padding: 10px 5px;
}
#app ul li.active{
background-color: rgb(168, 180, 235);
border-radius: 10px;
}
</style>
</head>
<body>
<div id="app">
<audio :src="currentSrc" controls autoplay @ended="handleEnded"></audio>
<ul>
<li :class="{active:currentIndex===index}" v-for='(item,index) in musicData' :key="item.id" @click="handleClick(item.songSrc,index)">
<h3>{{item.id}}--歌曲: {{item.name}}</h3>
<p>歌手: {{item.author}}</p>
</li>
</ul>
<button @click="handleNext">下一首</button>
<button @click="handlePrev">上一首</button>
</div>
<script src="./vue.js"></script>
<script>
const musicData = [{
id:1,
name:'大籽 - 白月光与朱砂痣',
author:'大籽',
songSrc:'./static/大籽 - 白月光与朱砂痣.mp3'
},
{
id:2,
name:'MKJ - Time',
author:'MKJ',
songSrc:'./static/MKJ - Time.mp3'
},
{
id:3,
name:'清远Dj鸿少-全国语Club音乐放过自己庄心妍专辑慢摇串烧',
author:'清远Dj鸿少',
songSrc:'./static/清远Dj鸿少-全国语Club音乐放过自己庄心妍专辑慢摇串烧.mp3'
}
]
new Vue({
el:'#app',
data:{
musicData,
currentSrc:'./static/大籽 - 白月光与朱砂痣.mp3',
currentIndex:0
},
methods:{
handleClick(src,index){
this.currentSrc = src;
this.currentIndex = index;
},
handleEnded(){
this.handleNext();
},
handleNext(){
this.currentIndex++;
if(this.currentIndex===this.musicData.length){
this.currentIndex = 0
}
this.currentSrc = this.musicData[this.currentIndex].songSrc;
},
handlePrev(){
this.currentIndex--;
if(this.currentIndex===-1){
this.currentIndex=this.musicData.length-1;
}
console.log(this.currentIndex);
this.currentSrc = this.musicData[this.currentIndex].songSrc;
}
}
})
</script>
</body>
</html>
14、音乐播放器 computed方法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>案例:音乐播放器 computed</title>
<style>
* {
padding: 0;
margin: 0;
}
ul {
list-style: none;
}
ul li {
margin: 20px 20px;
padding: 10px 5px;
border-radius: 3px;
}
ul li.active {
background-color: #D2E2F3;
}
</style>
</head>
<body>
<div id='app'>
<audio :src="getCurrentSongSrc" controls autoplay @ended='handleEnded'></audio>
<ul>
<li :class='{active:index===currentIndex}' v-for='(item,index) in musicData' :key='item.id'
@click='handleClick(index)'>
<h2>{{item.id}}-歌名：{{item.name}}</h2>
<p>{{item.author}}</p>
</li>
</ul>
<button @click='handlePrev'>上一首</button>
<button @click='handleNext'>下一首</button>
</div>
<script src="./vue.js"></script>
<script>
const musicData = [{
id: 1,
name: '于荣光 - 少林英雄',
author: '于荣光',
songSrc: './static/于荣光 - 少林英雄.mp3'
},
{
id: 2,
name: 'Joel Adams - Please Dont Go',
author: 'Joel Adams',
songSrc: './static/Joel Adams - Please Dont Go.mp3'
},
{
id: 3,
name: 'MKJ - Time',
author: 'MKJ',
songSrc: './static/MKJ - Time.mp3'
},
{
id: 4,
name: 'Russ - Psycho (Pt. 2)',
author: 'Russ',
songSrc: './static/Russ - Psycho (Pt. 2).mp3'
}
];
new Vue({
el: '#app',
data: {
musicData,
currentIndex: 0
},
computed:{
getCurrentSongSrc(){
return this.musicData[this.currentIndex].songSrc;
}
},
methods: {
handleClick(index) {
this.currentIndex = index;
},
handleEnded() {
this.handleNext();
},
handlePrev(){
this.currentIndex--;
if(this.currentIndex===-1){
this.currentIndex = this.musicData.length-1;
}
},
handleNext() {
this.currentIndex++;
if (this.currentIndex === this.musicData.length) {
this.currentIndex = 0;
}
}
}
})
</script>
<!-- 18511803134 小马哥 -->
<!-- vue组件 -->
<!-- ajax axios ajax库 -->
</body>
</html>
作者：龙飞
-------------------------------------------
个性签名：独学而无友，则孤陋而寡闻。做一个灵魂有趣的人！
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