Vue3自定义指令中动态参数的使用
作者：温新
时间：2021-08-11
hi，我是温新，一名PHPer
动态指令参数：指令的参数可以是动态的，也就是可以变化的。如v-mydirective:[argument]="value"中，argument参数可以根据组件实例数据进行更新！
基本案例
<span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">directives</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">styles</span>: {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 自定义指令参数</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">mounted</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 255)">el</span>, <span style="box-sizing: border-box;color: rgb(0, 0, 255)">params</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">console</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">log</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">el</span>, <span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> };</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">app</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Vue</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">createApp</span>({</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">directives</span>,</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">template</span>:<span style="box-sizing: border-box;color: rgb(255, 85, 0)">`<p v-styles="'green'">使用动态指令参数灵活修改元素样式</p>`</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> });</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">app</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">mount</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'#app'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span>
请观察el与params这个数据，params为第二参数，接收指令参数数据。打印出来的params中的arg为自定义参数键名（参数），value是参数值。
基础使用：修改元素文本颜色
<span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">div</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">id</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"app"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">div</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">directives</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">styles</span>: {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">mounted</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 255)">el</span>, <span style="box-sizing: border-box;color: rgb(0, 0, 255)">params</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 修改文本颜色为绿色</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">el</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">style</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">color</span><span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">value</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> };</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">app</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Vue</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">createApp</span>({</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">directives</span>,</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 传入颜色</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">template</span>:<span style="box-sizing: border-box;color: rgb(255, 85, 0)">`<p v-styles="'green'">使用动态指令参数灵活修改元素样式</p>`</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> });</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">app</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">mount</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'#app'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span>
灵活的使用动态参数修改样式
<span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">directives</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">styles</span>: {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">mounted</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 255)">el</span>, <span style="box-sizing: border-box;color: rgb(0, 0, 255)">params</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">console</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">log</span>(<span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>)</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 修改文本颜色为绿色</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">el</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">style</span>[<span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">arg</span>]<span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">value</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> };</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">app</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Vue</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">createApp</span>({</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">directives</span>,</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 传入颜色</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">template</span>:<span style="box-sizing: border-box;color: rgb(255, 85, 0)">`<p v-styles:fontWeight="'bold'">使用动态指令参数灵活修改元素样式</p>`</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> });</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">app</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">mount</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'#app'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span>
使用动态参数之后想改什么样式就如什么样式。比如：我现在后悔了，加粗太不符合本页面了，我要修改成背景色为绿色。思考下，如果不使用动态参数该怎么做？
使用了动态参数后，非常的方便，如下修改行：
<span style="box-sizing: border-box;padding-right: 0.1px">const app = Vue.createApp({</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">directives,</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> // 修改颜色</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> template:`<span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">p</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">v-styles:background</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"'green'"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span>使用动态指令参数灵活修改元素样式<span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">p</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span>`</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px">});</span>
绑定的参数为
background，其值是green
与数据进行绑定
<span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">div</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">id</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"app"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">div</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">directives</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">styles</span>: {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 只使用mounted时，修改样式不会发生变化</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">mounted</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 255)">el</span>, <span style="box-sizing: border-box;color: rgb(0, 0, 255)">params</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">el</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">style</span>[<span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">arg</span>]<span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">value</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> },</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 要使得修改样式发生变化需要使用updated进行重新渲染</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">updated</span>(<span style="box-sizing: border-box;color: rgb(0, 0, 255)">el</span>, <span style="box-sizing: border-box;color: rgb(0, 0, 255)">params</span>){</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">el</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">style</span>[<span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">arg</span>]<span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">value</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> };</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">app</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Vue</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">createApp</span>({</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">directives</span>,</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">data</span> () {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">return</span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">background</span>:<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'red'</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> },</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 传入颜色</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">template</span>:<span style="box-sizing: border-box;color: rgb(255, 85, 0)">`<p v-styles:background="background">使用动态指令参数灵活修改元素样式</p>`</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> });</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">vm</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">app</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">mount</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'#app'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span>
主要注意的是，若没有updated，那么在控制台对样式进行修改，元素的样式是不会发生变化的。如vm.$data.background="pink"；要想样式发生变化，就必须使用updated就行更新并重新渲染页面。
mounted与updated的写是一样的，此时可以对它进行简化操作。注意：我这里换成全局自定义组件。案例如下：
<span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">div</span> <span style="box-sizing: border-box;color: rgb(0, 0, 204)">id</span>=<span style="box-sizing: border-box;color: rgb(170, 17, 17)">"app"</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">div</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"><</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">app</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">Vue</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">createApp</span>({</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">data</span> () {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">return</span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">background</span>:<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'red'</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> }</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> },</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// 传入颜色</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">template</span>:<span style="box-sizing: border-box;color: rgb(255, 85, 0)">`<p v-styles:background="background">使用动态指令参数灵活修改元素样式</p>`</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> });</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(170, 85, 0)">// created与updated操作一样时，简化写法</span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">app</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">directive</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'styles'</span>,(<span style="box-sizing: border-box;color: rgb(0, 0, 255)">el</span>,<span style="box-sizing: border-box;color: rgb(0, 0, 255)">params</span>) <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=></span> {</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(0, 85, 170)">el</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">style</span>[<span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">arg</span>]<span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span><span style="box-sizing: border-box;color: rgb(0, 85, 170)">params</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">value</span>;</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> });</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span style="box-sizing: border-box"></span></span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"> <span style="box-sizing: border-box;color: rgb(119, 0, 136)">const</span> <span style="box-sizing: border-box;color: rgb(0, 0, 255)">vm</span> <span style="box-sizing: border-box;color: rgb(152, 26, 26)">=</span> <span style="box-sizing: border-box;color: rgb(0, 0, 0)">app</span>.<span style="box-sizing: border-box;color: rgb(0, 0, 0)">mount</span>(<span style="box-sizing: border-box;color: rgb(170, 17, 17)">'#app'</span>);</span><br></br><span style="box-sizing: border-box;padding-right: 0.1px"><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)"></</span><span style="box-sizing: border-box;color: rgb(17, 119, 0)">script</span><span class="cm-tag cm-bracket" style="box-sizing: border-box;color: rgb(17, 119, 0)">></span></span>
我是温新
第天进步一点，就一点点
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