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Vue1-2.html
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<!DOCTYPE html>
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<a title='强制绑定class与style' href='/Vue1-2.html'><img class='thumbnail' src='https://cdn.jsdelivr.net/gh/crainyday/blog@master/imgs/more/more05.png'></a>
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强制绑定class与style
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<p>crainyday</p>
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<p>发布于：2019年7月30日</p>
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<section class="article typo">
<div class="article-entry" itemprop="articleBody">
<p>Vue动态的改变class与style属性值</p>
<a id="more"></a>
<h2 id="1-理解">1.理解</h2>
<blockquote>
<p>一般在应用界面中, 某个(些)元素的样式是变化的, class/style绑定就是专门用来实现动态样式效果的技术</p>
</blockquote>
<h2 id="2-class绑定">2.class绑定</h2>
<blockquote>
<p>html用法 :class=“variable”</p>
<p>其中variable是data中的变量, variable有三种类型: 字符串、对象、数组.</p>
</blockquote>
<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><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">title</span>></span>Test<span class="tag"></<span class="name">title</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">style</span>></span><span class="undefined"></span></span><br><span class="line"><span class="css"> <span class="selector-class">.classA</span> {</span></span><br><span class="line"><span class="undefined"> color: red;</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="css"> <span class="selector-class">.classB</span> {</span></span><br><span class="line"><span class="undefined"> color: blue;</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="css"> <span class="selector-class">.classC</span> {</span></span><br><span class="line"><span class="undefined"> font-size: 20px;</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">style</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><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. class绑定: :class='xxx'<span class="tag"></<span class="name">h2</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span> <span class="attr">class</span>=<span class="string">"classC"</span> <span class="attr">:class</span>=<span class="string">"myClass"</span>></span>xxx是字符串<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">class</span>=<span class="string">"classC"</span> <span class="attr">:class</span>=<span class="string">"{classA:hasClassA,classB:hasClassB}"</span>></span>xxx是对象<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">:class</span>=<span class="string">"['classA','classC']"</span>></span>xxx是对象<span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"update"</span>></span>更新<span class="tag"></<span class="name">button</span>></span></span><br><span class="line"><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"></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"> myClass:<span class="string">"classA"</span>,</span></span><br><span class="line"><span class="actionscript"> hasClassA:<span class="literal">false</span>,</span></span><br><span class="line"><span class="actionscript"> hasClassB:<span class="literal">true</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="undefined"> update(){</span></span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.myClass = <span class="string">"classB"</span>;</span></span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.hasClassA = !<span class="keyword">this</span>.hasClassA;</span></span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.hasClassB = !<span class="keyword">this</span>.hasClassB;</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><br><span class="line"><span class="undefined"></span><span class="tag"></<span class="name">script</span>></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-style绑定">3.style绑定</h2>
<blockquote>
<p>html用法 :style="{ color: activeColor, fontSize: fontSize + ‘px’ }"<br>
其中activeColor/fontSize是data中的变量</p>
</blockquote>
<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></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="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>2. style绑定<span class="tag"></<span class="name">h2</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">p</span> <span class="attr">:style</span>=<span class="string">"{color:activeColor, fontSize: fontSize + 'px'}"</span>></span>:style="{ color: activeColor, fontSize: fontSize + 'px' }"<span class="tag"></<span class="name">p</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"update"</span>></span>更新<span class="tag"></<span class="name">button</span>></span></span><br><span class="line"><span class="tag"></<span class="name">div</span>></span></span><br><span class="line"></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"> activeColor:<span class="string">"red"</span>,</span></span><br><span class="line"><span class="undefined"> fontSize:20,</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="undefined"> update(){</span></span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.activeColor = <span class="string">"yellowGreen"</span>;</span></span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.fontSize = <span class="number">50</span>-<span class="keyword">this</span>.fontSize;</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><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br></pre></td></tr></table></figure>
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