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<!DOCTYPE html>
<html>
<head hexo-theme='https://volantis.js.org/#2.1.2'>
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<a title='Vue初识' href='/Vue1-0.html'><img class='thumbnail' src='https://cdn.jsdelivr.net/gh/crainyday/blog@master/imgs/more/more05.png'></a>
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Vue初识
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<p>发布于：2019年7月28日</p>
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<p>初步认识VUE</p>
<a id="more"></a>
<h2 id="1-Vue-js是什么">1. Vue.js是什么?</h2>
<ul>
<li>
<ol>
<li>一位华裔前Google工程师(尤雨溪)开发的<strong>前端js库</strong></li>
</ol>
</li>
<li>
<ol start="2">
<li>作用: 动态构建用户界面即前端界面</li>
</ol>
</li>
<li>
<ol start="3">
<li>特点:</li>
</ol>
<p>①遵循MVVM模式, M指Model数据, V指View, VM指的是view Model对象</p>
<p>②编码简洁, 体积小, 运行效率高, 移动/PC端开发</p>
<p>③它本身只关注UI, 可以轻松引入vue插件和其它第三库开发项目</p>
</li>
<li>
<ol start="4">
<li>与其它框架的关联:</li>
</ol>
<p>①借鉴angular的<strong>模板</strong>和<strong>数据绑定</strong>技术</p>
<p>②借鉴react的<strong>组件化</strong>和<strong>虚拟DOM</strong>技术</p>
</li>
<li>
<ol start="5">
<li>Vue包含一系列的扩展插件(库):</li>
</ol>
<p>①vue-cli: vue脚手架</p>
<p>②vue-resource(axios): ajax请求</p>
<p>③vue-router: 路由</p>
<p>④vuex: 状态管理</p>
<p>⑤vue-lazyload: 图片懒加载</p>
<p>⑥vue-scroller: 页面滑动相关</p>
<p>⑦mint-ui: 基于vue的组件库(移动端)</p>
<p>⑧element-ui: 基于vue的组件库(PC端)</p>
</li>
</ul>
<h2 id="2-基本使用">2. 基本使用</h2>
<ol>
<li>
<p>引入vue.js文件</p>
</li>
<li>
<p>创建Vue实例对象(vm), 指定选项(配置)对象</p>
<p>el : 指定Dom标签容器的选择器<br>
data : 指定初始化状态数据的对象/函数(返回一个对象)</p>
</li>
<li>
<p>在页面模板中使用}}或vue指令, 来显示数据</p>
</li>
</ol>
<p>例子:</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"><span class="comment"><!--</span></span><br><span class="line"><span class="comment"> 1. 引入Vue.js</span></span><br><span class="line"><span class="comment"> 2. 创建Vue对象</span></span><br><span class="line"><span class="comment"> el : 指定根element(选择器)</span></span><br><span class="line"><span class="comment"> data : 初始化数据(页面可以访问)</span></span><br><span class="line"><span class="comment"> 3. 双向数据绑定 : v-model</span></span><br><span class="line"><span class="comment"> 4. 显示数据 : {{xxx}}</span></span><br><span class="line"><span class="comment"> 5. 理解vue的mvvm实现</span></span><br><span class="line"><span class="comment">--></span></span><br><span class="line"> <span class="comment"><!--实现输入框与p标签的显示数据同步更新--></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">id</span>=<span class="string">"app"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">v-model</span>=<span class="string">"username"</span> /></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span>></span>Hello {{username}}<span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">script</span> <span class="attr">src</span>=<span class="string">"https://cdn.jsdelivr.net/npm/vue"</span>></span><span class="undefined"></span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span>></span><span class="undefined"></span></span><br><span class="line"><span class="actionscript"> <span class="comment">//创建vm实例</span></span></span><br><span class="line"><span class="actionscript"> <span class="keyword">const</span> vm = <span class="keyword">new</span> Vue({<span class="comment">//配置对象</span></span></span><br><span class="line"><span class="actionscript"> el:<span class="string">'#app'</span>,</span></span><br><span class="line"><span class="undefined"> data:{</span></span><br><span class="line"><span class="actionscript"> username:<span class="string">'Vue!'</span></span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"> })</span></span><br><span class="line"><span class="undefined"> </span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"><span class="comment"><!--</span></span><br><span class="line"><span class="comment">MVVM:</span></span><br><span class="line"><span class="comment">model:模型,即数据对象(data)</span></span><br><span class="line"><span class="comment">view:视图,模板页面</span></span><br><span class="line"><span class="comment">viewModel:视图模型,即Vue的一个实例</span></span><br><span class="line"><span class="comment">--></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br></pre></td></tr></table></figure>
<h2 id="3-模板的常见语法">3.模板的常见语法</h2>
<blockquote>
<p>模板(视图)的理解:<br>
动态的html页面, 包含了一些JS语法代码、大括号表达式、指令(以v-开头的自定义标签属性).</p>
</blockquote>
<blockquote>
<p>(1)双大括号表达式<br>
语法: {{exp}} 或 {{{exp}}}<br>
功能: 向页面输出数据, 可以调用对象的方法</p>
</blockquote>
<blockquote>
<p>(2)VUE指令：</p>
<p>①强制数据绑定<br>
功能: 指定变化的属性值<br>
完整写法: v-bind:xxx=‘yyy’ //yyy会作为表达式解析执行<br>
简洁写法: :xxx=‘yyy’</p>
<p>②绑定事件监听<br>
功能: 绑定指定事件名的回调函数<br>
完整写法: v-on:click=‘xxx’<br>
简洁写法: @click=‘xxx’</p>
</blockquote>
<p>例子:</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">div</span> <span class="attr">id</span>=<span class="string">"demo"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">h2</span>></span>1. 双大括号表达式<span class="tag"></<span class="name">h2</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span>></span>{{content}}<span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span>></span>{{content.toUpperCase()}}<span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span> <span class="attr">v-text</span>=<span class="string">"tag"</span>></span><span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span> <span class="attr">v-html</span>=<span class="string">"tag"</span>></span><span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> </span><br><span class="line"> <span class="tag"><<span class="name">h2</span>></span>2. 指令一: 强制数据绑定<span class="tag"></<span class="name">h2</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"url"</span>></span>访问指定站点<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">a</span> <span class="attr">v-bind:href</span>=<span class="string">"url"</span>></span>访问指定站点2<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">a</span> <span class="attr">:href</span>=<span class="string">"url"</span>></span>访问指定站点3<span class="tag"></<span class="name">a</span>></span><span class="tag"><<span class="name">br</span>></span></span><br><span class="line"></span><br><span class="line"> <span class="tag"><<span class="name">h2</span>></span>3. 指令二: 绑定事件监听<span class="tag"></<span class="name">h2</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">button</span> <span class="attr">v-on:click</span>=<span class="string">"test1"</span>></span>点我<span class="tag"></<span class="name">button</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"test2(content)"</span>></span>点我<span class="tag"></<span class="name">button</span>></span><span class="comment"><!--带参的方法--></span></span><br><span class="line"><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"><span class="tag"><<span class="name">script</span> <span class="attr">src</span>=<span class="string">"https://cdn.jsdelivr.net/npm/vue"</span>></span><span class="undefined"></span><span class="tag"></<span class="name">script</span>></span></span><br><span class="line"><span class="tag"><<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span>></span><span class="undefined"></span></span><br><span class="line"><span class="actionscript"> <span class="keyword">new</span> Vue({</span></span><br><span class="line"><span class="actionscript"> el:<span class="string">"#demo"</span>,</span></span><br><span class="line"><span class="undefined"> data:{</span></span><br><span class="line"><span class="actionscript"> content:<span class="string">"Hello Vue!!!"</span>,</span></span><br><span class="line"><span class="handlebars"><span class="xml"> tag:"<span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">'https://www.baidu.com/'</span>></span>test<span class="tag"></<span class="name">a</span>></span>",</span></span></span><br><span class="line"><span class="actionscript"> url:<span class="string">"https://www.baidu.com/"</span></span></span><br><span class="line"><span class="undefined"> },</span></span><br><span class="line"><span class="undefined"> methods:{</span></span><br><span class="line"><span class="actionscript"> test1(event){<span class="comment">//默认事件参数</span></span></span><br><span class="line"><span class="undefined"> alert(event);</span></span><br><span class="line"><span class="actionscript"> alert(<span class="string">"test1()"</span>);</span></span><br><span class="line"><span class="undefined"> },</span></span><br><span class="line"><span class="undefined"> test2(value){</span></span><br><span class="line"><span class="actionscript"> alert(<span class="string">"test2("</span>+value+<span class="string">")"</span>);</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"> });</span></span><br><span class="line"><span class="undefined"></span><span class="tag"></<span class="name">script</span>></span></span><br></pre></td></tr></table></figure>
<h2 id="4-Vue对象的常用配置选项">4. Vue对象的常用配置选项</h2>
<ul>
<li>
<blockquote>
<p>①el:</p>
<p>指定dom标签容器的选择器, Vue就会管理对应的标签及其子标签</p>
</blockquote>
</li>
<li>
<blockquote>
<p>②data: 对象或函数类型<br>
指定初始化状态属性数据的对象, vm也会自动拥有data中所有属性, 页面中可以直接访问使用<br>
数据代理: 由vm对象来代理对data中所有属性的操作(读/写)</p>
</blockquote>
</li>
<li>
<blockquote>
<p>③methods: 包含多个方法的对象<br>
供页面中的事件指令来绑定回调, 回调函数默认有event参数, 但也可以指定自己的参数<br>
所有的方法由vue对象来调用, 访问data中的属性直接使用 <a href="http://this.xxx" target="_blank" rel="noopener">this.xxx</a></p>
</blockquote>
</li>
<li>
<blockquote>
<p>④computed: 包含多个方法的对象<br>
对状态属性进行计算返回一个新的数据, 供页面获取显示<br>
一般情况下是相当于是一个只读的属性<br>
利用set/get方法来实现属性数据的计算读取, 同时监视属性数据的变化<br>
如何给对象定义get/set属性<br>
在创建对象时指定: get name () {return xxx} / set name (value) {}<br>
对象创建之后指定: Object.defineProperty(obj, age, {get(){}, set(value){}})</p>
</blockquote>
</li>
<li>
<blockquote>
<p>⑤watch: 包含多个属性监视的对象<br>
分为一般监视和深度监视<br>
xxx: function(value){}<br>
xxx : {<br>
deep : true,<br>
handler : fun(value)<br>
}<br>
另一种添加监视方式: vm.$watch(‘xxx’, function(value){})</p>
</blockquote>
</li>
</ul>
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<p class='content'>计算属性—>computed 监视—>watch
1.计算属性
在computed属性对象中定义计算属性的方法, 在页面中使用{{方法名}}来显示计算的结果.
在使用计算属性时...</p>
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<p class='content'>DBUtils------Apache下的一个JDBC开源工具类库
1.Apache—DBUtils简介
commons-dbutils 是 Apache 组织提供的一个开源 JDBC工...</p>
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