本篇导航：
- 介绍与安装
- vue常用指令
一、介绍与安装
vue是一套构建用户界面的JAVASCRIPT框架。与其它大型框架不同的是，Vue 被设计为可以自底向上逐层应用。Vue 的核心库只关注视图层，不仅易于上手，还便于与第三方库或既有项目整合。
1、安装
下载vue.js：https://cn.vuejs.org/v2/guide/installation.html
2、CDN
也可以不下载直接使用cdn
https://cdn.jsdelivr.net/npm/vue
3、引用
<script src="vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
4、使用格式
{{}}，里面可以放表达式
<div id="app"> ???//和django中模版渲染一样使用｛｛变量｝｝插入文本 ???{{ message }}</div><script> ???//实例化Vue ???var app = new Vue({ ???????//定位标签 ???表示在当前这个元素内开始使用VUE ???????el: ‘#app‘, ???????//变量 ???????data: { ???????????message: ‘Hello Vue!‘ ???????} ???})<script>二、vue常用指令
指令：是带有V-前缀的特殊属性，通过属性来操作元素
1、v-text,v-html
v-text：可以在元素当中插入值
v-html：元素不中不仅可以插入文本，还可以插入标签
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script></head><body> ???<div id="app"> ???????<p>{{msg}}</p> ???????<p>{{80+2}}</p> ???????<p>{{20>30}}</p> ???????????我是：<h1 v-text="msg">{{str}}</h1> ???????????你是：<h1 v-text="msg">2222222222222</h1> ???????????<h2 v-html="hd"></h2> ???????????<h2 v-html="str"></h2> ???</div> ???<script> ???????new Vue({ ???????????el: "#app", //表示在当前这个元素内开始使用VUE ???????????data:{ ???????????????msg: "我是老大", ???????????????hd: "<input type=‘button‘ value=‘你是小三‘>", ???????????????str: "我要发财!" ???????????} ???????}) ???</script></body></html>2、v-if,v-show
v-if：根据表达式的真假值来动态插入和移除元素
v-show：根据表达式的真假值来隐藏和显示元素
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script></head><body> ?????<div id="app"> ??????<p v-if="pick">我是刘德华</p> ??????<p v-else>我是张学友</p> ??????<p v-show="temp">我是赵本山</p> ??????<p v-show="ok">你喜欢我吗？</p> ???</div> ???<script> ???????var vm = new Vue({ ???????????el: "#app", ????????????data:{ ???????????????pick: false, ???????????????temp: true, ???????????????ok: true ???????????} ???????}) ????????window.setInterval(function(){ ????????????vm.ok = !vm.ok; ????????},1000) ???</script></body></html>3、v-for
v-for：根据变量的值来循环渲染元素
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script> ???<style> ???????ul li{ ???????????list-style: none; ???????} ???</style></head><body> ???<div id="app"> ???????<ul> ???????????<li v-for="(item,index2) in arr"> ???????????????{{item}}: {{index2}} ???????????</li> ???????</ul> ???????<ul> ???????????<li v-for="(item,key,index) in obj"> ???????????????{{item}}: {{key}}:{{index}} ???????????</li> ???????</ul> ???????????<ul> ???????????????<li v-for="item in obj2"> ???????????????????{{item.username}} ???????????????????{{item.age}} ???????????????????{{item.sex}} ???????????????</li> ???????????</ul> ???????<div v-for="i in 8"> ???????????{{i}} ???????</div> ???</div> ???<script> ???????new Vue({ ???????????el: "#app", ????????????data:{ ???????????????arr: [11,22,3344,55], ???????????????obj: {a:"张三",b:"李四",c:"王大拿",d:"谢大脚"}, ???????????????obj2:[ ???????????????????{username: "jason"}, ???????????????????{age: 20}, ???????????????????{sex: "male"} ???????????????], ???????????} ???????}) ???</script></body></html>4、v-on
1）v-on：监听元素事件，并执行相应的操作
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<script src="vue.js"></script></head><body> ???<div id="app"> ???????<ul> ???????????<li v-for="(item,index) in arr"> ???????????????{{item}}: {{index}} ???????????</li> ???????</ul> ???????<input type="button" value="点我吧!" @click="show()"> ???</div> ???<script> ???????new Vue({ ???????????el: "#app", ???????????data:{ ???????????????arr: [11,22,33,44,55], ???????????????], ???????????}, ???????//监听的事件 ????????methods: { ????????????show: function () { ????????????????this.arr.pop(); ???????????} ???????} ???}) ???</script></body></html> ???2）小实例：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script> ???<style> ???????ul li{ ???????????list-style: none; ???????} ???</style></head><body> ?????<div id="app"> ???????<ul> ???????????<li> ???????????????<input type="checkbox">苹果 ???????????</li> ???????????<li> ???????????????<input type="checkbox">香蕉 ???????????</li> ???????????<li> ???????????????<input type="checkbox">香梨 ???????????</li> ???????????<li> ???????????????<input type="checkbox" v-on:click="create()">其它 ???????????</li> ???????????<li v-html="htmlstr" v-show="test"> ???????????</li> ???????</ul> ???</div> ???<script> ???????var vm = new Vue({ ???????????el: "app", ????????????data:{ ???????????????htmlstr: "<textarea></textarea>", ???????????????test: false ???????????}, ???????????methods: { ???????????????create: function () { ???????????????????this.test = !this.test; ???????????????} ???????????} ???????}) ???</script></body></html><!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<script src="vue.js"></script> ???<style> ???????ul li{ ???????????list-style: none; ???????????display: inline-block; ???????????border: 1px solid cornflowerblue; ???????????height:40px; ???????????line-height: 40px; ???????????width: 120px; ???????????text-align: center; ???????} ???</style></head><body> ???<div id="mybox"> ???????<ul> ???????????<li> ???????????????<span v-on:click="qh(true)">二唯码登录</span> ???????????</li> ???????????<li> ???????????????<span v-on:click="qh(false)">邮箱登录</span> ???????????</li> ???????</ul> ???????<div v-show="temp"> ???????????<img src="erma.jpg"> ???????</div> ???????<div v-show="!temp"> ???????????<form action="http://mail.163.com" method="post"> ???????????????<p><input type="email"></p> ???????????????<p><input type="password"></p> ???????????????<p><input type="submit" value="登录"></p> ???????????</form> ???????</div> ???</div> ???<script> ???????new Vue({ ???????????el: "#mybox", ???????????data: { ???????????????temp: true ???????????}, ???????????methods: { ???????????????qh: function (t) { ???????????????????this.temp = t ???????????????} ???????????} ???????}) ???</script></body></html>3）v-on简写
//标准书写：<input type="button" value="点我吧!" v-on:click="show()">//简写：<input type="button" value="点我吧!" @click="show()">
5、v-bind
1）v-bind：绑定元素的属性来执行相应的操作
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<script src="vue.js"></script> ???<style> ???????.bk_1{ ???????????background-color: cornflowerblue; ???????????width: 200px; ???????????height: 200px; ???????} ???????.bk_2{ ???????????background-color: red; ???????????width: 200px; ????????????height: 200px; ???????} ???????.bk_3{ ???????????border: 5px solid #000; ???????} ???</style></head><body> ???<div id="app"> ???????<a href="http://www.qq.com" v-bind:title="msg">腾讯</a> ???????<div :class="bk"></div> ???????<div :class="bk2"></div> ???????<div :class="{bk_2:temp}">fdjjdjdkdkkeedd</div> ???????<div :class="[bk2,bk3]">8888888888</div> ???</div> ???<script> ??????var vm = ?new Vue({ ???????????el: "#app", //表示在当前这个元素内开始使用VUE ???????????data:{ ???????????????msg: "我想去腾讯公司上班", ???????????????bk:"bk_1", ???????????????bk2:"bk_2", ???????????????bk3:"bk_3", ???????????????temp: false ???????????} ???????}) ???</script></body></html>2）简写
//标准写法：<div v-bind:class="bk"></div>//简写：<div :class="bk"></div>
6、v-model
v-model：实现了数据和视图的双向绑定
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script> ???<style> ???????ul li{ ???????????list-style: none; ???????} ???</style></head><body> ???<div id="app"> ???????<input v-model="msg"> ???????<p>{{msg}}</p> ???????<input type="button" value="变化" @click="change"> ???</div> ???<script> ???????new Vue({ ???????????el: "#app", ????????????data:{ ?????????????msg: "aaaaa" ???????????}, ???????????methods: { ???????????????change: function () { ???????????????????this.msg = 8888888; ???????????????} ???????????} ???????}) ???</script></body></html>小实例：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script> ???<style> ???????ul li{ ???????????list-style: none; ???????} ???</style></head><body> ?????<div id="app"> ???????<div> ???????????<input type="text" placeholder="姓名" v-model="username"> ???????????<input type="text" placeholder="年龄" v-model="age"> ???????????<input type="button" value="增加" @click="add"> ???????</div> ?????????<div> ???????????????<table cellpadding="0" border="1"> ???????????????????<tr v-for="item in arr"> ???????????????????????<td>{{item.username}}</td> ???????????????????????<td>{{item.age}}</td> ???????????????????????<td><input type="button" value="删除" @click="del(index)"></td> ???????????????????</tr> ???????????????</table> ?????????</div> ???</div> ???<script> ???????new Vue({ ???????????el: "#app", ???????????data:{ ???????????????username: "", ???????????????age: "", ???????????????arr: [] ???????????}, ???????????methods: { ???????????????add: function () { ???????????????????this.arr.push({username:this.username,age: this.age}); ???????????????????console.log(this.arr); ???????????????}, ???????????????del: function (index) { ???????????????????this.arr.splice(index,1); ???????????????} ???????????} ???????}) ???</script></body></html>7、自定义指令
特定指令无法满足我们的开发需求时可以自定义指令
当进入一个页面时，输入框获取焦点，且背景颜色是蓝色，字体颜色是白色：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ??<script src="vue.js"></script> ???<style> ???????ul li{ ???????????list-style: none; ???????} ???</style></head><body> ?????<div id="app"> ???????????<input type="text" v-focus> ???</div> ???<script> ???????new Vue({ ???????????el: "#app", //表示在当前这个元素内开始使用VUE ???????????data:{ ???????????}, ???????????//自定义指令 ???????????directives: { ???????????????focus: { ???//指令的名字 ???????????????????//当绑定的元素显示时 ???????????????????inserted: function (tt) { ???????????????????????tt.focus(); ???????????????????????tt.style.backgroundColor = "blue"; ???????????????????????tt.style.color = "#fff" ???????????????????} ???????????????} ???????????} ???????}) ???</script></body></html>98、vue.js简单入门
原文地址：https://www.cnblogs.com/liluning/p/8352397.html