# 基础语法
- 简单例子
```
<pre class="calibre14">```
<span class="token"><</span>div id<span class="token">=</span><span class="token4">"app"</span><span class="token">></span>
<span class="token2">{</span><span class="token2">{</span> message <span class="token2">}</span><span class="token2">}</span>
<span class="token"><</span><span class="token">/</span>div<span class="token">></span>
<span class="token"><</span>script<span class="token">></span>
var app <span class="token">=</span> <span class="token5">new</span> <span class="token1">Vue</span><span class="token2">(</span><span class="token2">{</span>
el<span class="token2">:</span> <span class="token4">'#app'</span><span class="token2">,</span>
data<span class="token2">:</span> <span class="token2">{</span>
message<span class="token2">:</span> <span class="token4">'测试vue!'</span>
<span class="token2">}</span>
<span class="token2">}</span><span class="token2">)</span>
<span class="token"><</span><span class="token">/</span>script<span class="token">></span>
```
```
```
<pre class="calibre14">```
<span class="token"><</span>div id<span class="token">=</span><span class="token4">"app"</span><span class="token">></span>
<span class="token"><</span>ul<span class="token">></span><span class="token"><</span>li v<span class="token">-</span><span class="token5">for</span><span class="token">=</span><span class="token4">"rs in todos"</span><span class="token">></span> <span class="token2">{</span><span class="token2">{</span>rs<span class="token2">.</span>text<span class="token2">}</span><span class="token2">}</span><span class="token"><</span><span class="token">/</span>li<span class="token">></span><span class="token"><</span><span class="token">/</span>ul<span class="token">></span>
<span class="token"><</span><span class="token">/</span>div<span class="token">></span>
var app <span class="token">=</span> <span class="token5">new</span> <span class="token1">Vue</span><span class="token2">(</span><span class="token2">{</span>
el<span class="token2">:</span> <span class="token4">'#app'</span><span class="token2">,</span>
data<span class="token2">:</span> <span class="token2">{</span>
todos<span class="token2">:</span> <span class="token2">[</span>
<span class="token2">{</span> text<span class="token2">:</span> <span class="token4">'学习 JavaScript'</span> <span class="token2">}</span><span class="token2">,</span>
<span class="token2">{</span> text<span class="token2">:</span> <span class="token4">'学习 Vue'</span> <span class="token2">}</span><span class="token2">,</span>
<span class="token2">{</span> text<span class="token2">:</span> <span class="token4">'整个牛项目'</span> <span class="token2">}</span>
<span class="token2">]</span>
<span class="token2">}</span>
<span class="token2">}</span><span class="token2">)</span>
```
```
- 模板语法
```
<pre class="calibre14">```
一次插值<span class="token2">,</span>后面不会改变 v<span class="token">-</span>once
输出原始值 <span class="token"><</span>span v<span class="token">-</span>html<span class="token2">:</span>style<span class="token">=</span><span class="token4">"msg"</span><span class="token">></span>你好<span class="token"><</span><span class="token">/</span>span<span class="token">></span>
输出属性 <span class="token"><</span>span v<span class="token">-</span>bind<span class="token2">:</span>style<span class="token">=</span><span class="token4">"msg"</span><span class="token">></span>你好<span class="token"><</span><span class="token">/</span>span<span class="token">></span>
<span class="token5">if</span>语句 <span class="token"><</span>span v<span class="token">-</span><span class="token5">if</span><span class="token">=</span><span class="token4">"msg"</span><span class="token">></span><span class="token3">true</span>看见我<span class="token"><</span><span class="token">/</span>span<span class="token">></span>
<span class="token"><</span>h1 v<span class="token">-</span><span class="token5">if</span><span class="token">=</span><span class="token4">"msg=='ok'"</span><span class="token">></span>是<span class="token"><</span><span class="token">/</span>h1<span class="token">></span>
<span class="token"><</span>h1 v<span class="token">-</span><span class="token5">else</span><span class="token">-</span><span class="token5">if</span><span class="token">=</span><span class="token4">"msg=='ok1'"</span><span class="token">></span>是<span class="token3">1</span><span class="token"><</span><span class="token">/</span>h1<span class="token">></span>
<span class="token"><</span>h1 v<span class="token">-</span><span class="token5">else</span><span class="token">></span>否<span class="token"><</span><span class="token">/</span>h1<span class="token">></span>
管理重复数据 key<span class="token">=</span><span class="token4">"username-input"</span>
监听事件 <span class="token"><</span>a v<span class="token">-</span>on<span class="token2">:</span>click<span class="token">=</span><span class="token4">"alert(1)"</span><span class="token">></span><span class="token3">123</span><span class="token"><</span><span class="token">/</span>a<span class="token">></span>
v<span class="token">-</span>bind缩写 <span class="token2">:</span>
v<span class="token">-</span>on 缩写@
数组方式调用class <span class="token"><</span>div v<span class="token">-</span>bind<span class="token2">:</span>class<span class="token">=</span><span class="token4">"[activeClass, errorClass]"</span><span class="token">></span><span class="token"><</span><span class="token">/</span>div<span class="token">></span>
绑定内联样式 <span class="token"><</span>div v<span class="token">-</span>bind<span class="token2">:</span>style<span class="token">=</span><span class="token4">"{ color: activeColor, fontSize: fontSize + 'px' }"</span><span class="token">></span><span class="token"><</span><span class="token">/</span>div<span class="token">></span>
显示隐藏 <span class="token"><</span>h1 v<span class="token">-</span>show<span class="token">=</span><span class="token4">"msg=='ok'"</span><span class="token">></span>是<span class="token"><</span><span class="token">/</span>h1<span class="token">></span> 不支持<span class="token"><</span>template<span class="token">></span>和<span class="token5">else</span><span class="token2">,</span>是display显示隐藏
列表渲染 <span class="token"><</span>li v<span class="token">-</span><span class="token5">for</span><span class="token">=</span><span class="token4">"item in items"</span><span class="token">></span>
<span class="token2">{</span><span class="token2">{</span> item<span class="token2">.</span>message <span class="token2">}</span><span class="token2">}</span>
<span class="token"><</span><span class="token">/</span>li<span class="token">></span>
带索引
<span class="token"><</span>li v<span class="token">-</span><span class="token5">for</span><span class="token">=</span><span class="token4">"(item, index) in items"</span><span class="token">></span>
<span class="token2">{</span><span class="token2">{</span> parentMessage <span class="token2">}</span><span class="token2">}</span> <span class="token">-</span> <span class="token2">{</span><span class="token2">{</span> index <span class="token2">}</span><span class="token2">}</span> <span class="token">-</span> <span class="token2">{</span><span class="token2">{</span> item<span class="token2">.</span>message <span class="token2">}</span><span class="token2">}</span>
<span class="token"><</span><span class="token">/</span>li<span class="token">></span>
对象也支持三个参数
<span class="token"><</span>div v<span class="token">-</span><span class="token5">for</span><span class="token">=</span><span class="token4">"(value, key, index) in object"</span><span class="token">></span>
<span class="token2">{</span><span class="token2">{</span> index <span class="token2">}</span><span class="token2">}</span><span class="token2">.</span> <span class="token2">{</span><span class="token2">{</span> key <span class="token2">}</span><span class="token2">}</span><span class="token2">:</span> <span class="token2">{</span><span class="token2">{</span> value <span class="token2">}</span><span class="token2">}</span>
<span class="token"><</span><span class="token">/</span>div<span class="token">></span>
唯一性
<span class="token"><</span>div v<span class="token">-</span><span class="token5">for</span><span class="token">=</span><span class="token4">"item in items"</span> <span class="token2">:</span>key<span class="token">=</span><span class="token4">"item.id"</span><span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 内容 <span class="token">--</span><span class="token">></span>
<span class="token"><</span><span class="token">/</span>div<span class="token">></span>
方法
<span class="token"><</span>button v<span class="token">-</span>on<span class="token2">:</span>click<span class="token">=</span><span class="token4">"fn"</span><span class="token">></span>创建<span class="token"><</span><span class="token">/</span>button<span class="token">></span>
var app <span class="token">=</span> <span class="token5">new</span> <span class="token1">Vue</span><span class="token2">(</span><span class="token2">{</span>
el<span class="token2">:</span> <span class="token4">'#app'</span><span class="token2">,</span>
data<span class="token2">:</span> <span class="token2">{</span>msg<span class="token2">:</span><span class="token4">'ok1'</span>
<span class="token2">}</span> <span class="token2">,</span>methods<span class="token2">:</span><span class="token2">{</span>
<span class="token4">'fn'</span><span class="token2">:</span><span class="token5">function</span><span class="token2">(</span>event<span class="token2">)</span><span class="token2">{</span>
<span class="token1">alert</span><span class="token2">(</span><span class="token4">"q"</span><span class="token">+</span>this<span class="token2">.</span>msg<span class="token2">)</span>
<span class="token2">}</span>
<span class="token2">}</span>
<span class="token2">}</span><span class="token2">)</span>
```
```
- 事件修饰符
```
<pre class="calibre14">```
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 阻止单击事件继续传播 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>a v<span class="token">-</span>on<span class="token2">:</span>click<span class="token2">.</span>stop<span class="token">=</span><span class="token4">"doThis"</span><span class="token">></span><span class="token"><</span><span class="token">/</span>a<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 提交事件不再重载页面 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>form v<span class="token">-</span>on<span class="token2">:</span>submit<span class="token2">.</span>prevent<span class="token">=</span><span class="token4">"onSubmit"</span><span class="token">></span><span class="token"><</span><span class="token">/</span>form<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 修饰符可以串联 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>a v<span class="token">-</span>on<span class="token2">:</span>click<span class="token2">.</span>stop<span class="token2">.</span>prevent<span class="token">=</span><span class="token4">"doThat"</span><span class="token">></span><span class="token"><</span><span class="token">/</span>a<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 只有修饰符 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>form v<span class="token">-</span>on<span class="token2">:</span>submit<span class="token2">.</span>prevent<span class="token">></span><span class="token"><</span><span class="token">/</span>form<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 添加事件监听器时使用事件捕获模式 <span class="token">--</span><span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 即元素自身触发的事件先在此处处理,然后才交由内部元素进行处理 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>div v<span class="token">-</span>on<span class="token2">:</span>click<span class="token2">.</span>capture<span class="token">=</span><span class="token4">"doThis"</span><span class="token">></span><span class="token2">.</span><span class="token2">.</span><span class="token2">.</span><span class="token"><</span><span class="token">/</span>div<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 只当在 event<span class="token2">.</span>target 是当前元素自身时触发处理函数 <span class="token">--</span><span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 即事件不是从内部元素触发的 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>div v<span class="token">-</span>on<span class="token2">:</span>click<span class="token2">.</span>self<span class="token">=</span><span class="token4">"doThat"</span><span class="token">></span><span class="token2">.</span><span class="token2">.</span><span class="token2">.</span><span class="token"><</span><span class="token">/</span>div<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 点击事件将只会触发一次 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>a v<span class="token">-</span>on<span class="token2">:</span>click<span class="token2">.</span>once<span class="token">=</span><span class="token4">"doThis"</span><span class="token">></span><span class="token"><</span><span class="token">/</span>a<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 滚动事件的默认行为 <span class="token2">(</span>即滚动行为<span class="token2">)</span> 将会立即触发 <span class="token">--</span><span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 而不会等待 `onScroll` 完成 <span class="token">--</span><span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 这其中包含 `event<span class="token2">.</span><span class="token1">preventDefault</span><span class="token2">(</span><span class="token2">)</span>` 的情况 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>div v<span class="token">-</span>on<span class="token2">:</span>scroll<span class="token2">.</span>passive<span class="token">=</span><span class="token4">"onScroll"</span><span class="token">></span><span class="token2">.</span><span class="token2">.</span><span class="token2">.</span><span class="token"><</span><span class="token">/</span>div<span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 只有在 `keyCode` 是 <span class="token3">13</span> 时调用 `vm<span class="token2">.</span><span class="token1">submit</span><span class="token2">(</span><span class="token2">)</span>` <span class="token">--</span><span class="token">></span>
<span class="token"><</span>input v<span class="token">-</span>on<span class="token2">:</span>keyup<span class="token2">.</span><span class="token3">13</span><span class="token">=</span><span class="token4">"submit"</span><span class="token">></span>
<span class="token2">.</span>enter
<span class="token2">.</span>tab
<span class="token2">.</span>delete <span class="token2">(</span>捕获“删除”和“退格”键<span class="token2">)</span>
<span class="token2">.</span>esc
<span class="token2">.</span>space
<span class="token2">.</span>up
<span class="token2">.</span>down
<span class="token2">.</span>left
<span class="token2">.</span>right
```
```
- 表单
```
<pre class="calibre16">```
<span class="token"><</span>input v<span class="token">-</span>model<span class="token">=</span><span class="token4">"message"</span> placeholder<span class="token">=</span><span class="token4">"edit me"</span><span class="token">></span>
<span class="token"><</span>input type<span class="token">=</span><span class="token4">"checkbox"</span> id<span class="token">=</span><span class="token4">"checkbox"</span> v<span class="token">-</span>model<span class="token">=</span><span class="token4">"checked"</span><span class="token">></span>
<span class="token"><</span><span class="token">!</span><span class="token">--</span> 在“change”时而非“input”时更新 <span class="token">--</span><span class="token">></span>
<span class="token"><</span>input v<span class="token">-</span>model<span class="token2">.</span>lazy<span class="token">=</span><span class="token4">"msg"</span> <span class="token">></span>
<span class="token"><</span>input v<span class="token">-</span>model<span class="token2">.</span>number<span class="token">=</span><span class="token4">"age"</span> type<span class="token">=</span><span class="token4">"number"</span><span class="token">></span>
<span class="token"><</span>input v<span class="token">-</span>model<span class="token2">.</span>trim<span class="token">=</span><span class="token4">"msg"</span><span class="token">></span>
```
```
- 简介
- 第一章 数据库
- Mysql/mariadb
- 函数
- 基础
- 增删改索引
- 标准查询
- 高级查询
- TIDB集群mysql解决方案
- Redis
- 语言基础
- 5种数据类型
- 其他类型
- Sqlite
- 语言基础
- 常用查询
- 第二章 PHP
- 语言基础
- 第一课 流程控制和运算
- 第二课 数组
- 第三课 日期时间
- 第四课 常用函数
- 第五课 字符串
- 第六课 文件操作
- 第七课 面向对象
- 第八课 正则表达式
- 第九课 图片处理生成
- 第十课 curl/memche
- 第十一课 mysql和pdo
- 第十三课 cookie和session
- 第十四课 xml操作
- 第十五课 php5.3+新特性
- 第十六课 php7+
- 第十七课 密码安全
- 废弃函数
- php命令行
- redis应用
- 算法
- 排序算法
- 基础算法
- 无限级分类
- 自定义函数Fn
- 查找算法
- 自定义函数数据函数fn
- laravel
- 路由
- 常用语句
- 数据库
- dingo/api
- Yii2
- 控制器
- 常用类
- 数据库
- redis
- thinkphp6
- TP6文档
- TP6插件
- dedecms
- 织梦标签大全
- 数据库操作
- 内置函数和定义函数
- 织梦核心改动
- 织梦插件/底层标签开发
- PHP相关工具
- composer
- php开发环境phpenv
- Phpstorm使用
- windows编译php扩展
- PHP开源库
- 开源项目管理禅道
- sns_auth
- php-casbin权限控制
- php-jwt
- 微信SDKeasywechat
- querylist采集库
- workerman
- Box/Spout处理excel和csv
- dll扩展
- redis/memche/xdebug
- redis
- Lua
- php_xlswriter
- event
- swoole
- 常用代码库
- 微擎框架
- 第一课全局变量
- 第二课常用函数
- 第三课自定义微擎独有函数
- 第四课数据库操作
- 第五课微信端回复
- 第六课微擎高级操作
- 第八课global函数列表
- mainfest.xml详解
- js方法
- 人人商城
- 第一课model解读
- 第二课常用语句解读
- 第三课常用js解读
- 第四课附录常见问题
- 第五课附录处理报表|支付
- 常用JSON状态码
- 第三章 JavaScript
- js基础
- 浏览器对象
- 语言基础
- html5接口
- ES6新语法
- vue
- 基础语法
- 京东vueUI组件
- uniapp
- 组件开发规范
- nodejs
- 基础知识
- 安装node
- nvm不同版本node切换
- js常用标准库
- zepto/jquery
- weui
- js图标库
- elementUI
- validator表单验证
- layer弹出层
- requirejs
- wow动画
- 动画animate
- swiper4
- 百度编辑器
- flyio/axios/qs
- jquery.form
- bootstrap3
- clipboard复制
- slideout侧滑
- imagehover.css图片悬停动画
- webpack打包
- Bulma UI框架
- store 客户端存储
- lottie动画创建库
- sweetalert
- js自定义函数
- 常见JSSDK
- 微信公众号JSSDK
- 腾讯地图jssdk
- 微信小程序
- 第四章 编程语言
- markdown语言
- Dart语言
- Dart语言基础
- Flutter框架
- Lua语言
- 字符串,数组,表
- 自定义方法
- go语言
- 第1.1语言基本语法
- 第1.2流程控制
- 第1.3函数
- 第1.4结构体
- 第1.5接口
- 第1.6包
- go语言框架Gin
- CSS3语言
- CSS与CSS3
- 选择符
- 属性
- css3
- loading动画
- HTML5语言
- less
- sass
- C#
- 基础知识
- 函数
- 第五章 开发工具
- git
- nginx/apache服务器
- Linux常用操作
- crontab定时任务
- 注册表与cmd
- 阿里云ECS
- frp穿透和ssl续期
- 宝塔安装
- 树莓派
- 浏览器模拟
- 火狐/chrome常用插件
- WSL安装使用
- mac brew和终端命令
- win10相关