css 选取器类型有哪几种？
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CSS是对样式的修饰，权重<span style="color: black;">表率</span>着某种级别，权重决定了你css规则<span style="color: black;">怎么样</span>被浏览器解析直到生效，css权重关系到你的css规则是<span style="color: black;">怎么样</span><span style="color: black;">表示</span>的。<span style="color: black;">怎样</span>学习，理论+案例代码。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">初步<span style="color: black;">认识</span>：CSS<span style="color: black;">选取</span>器<span style="color: black;">便是</span><span style="color: black;">按照</span><span style="color: black;">区别</span>需求把<span style="color: black;">区别</span>的标签选出来，设置相应的样式</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">案例</p>
<div style="color: black; text-align: left; margin-bottom: 10px;">h1{
color:blue;
font-size:15px;
}</div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">以上h1标签<span style="color: black;">选取</span>器，做了两件事：</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1.找到所有的h1标签（<span style="color: black;">选取</span>对象）</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2.设置这些标签的样式：字体颜色为蓝色，字体<span style="color: black;">体积</span>为15px（设置样式）</p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CSS<span style="color: black;">选取</span>器<span style="color: black;">功效</span>：CSS<span style="color: black;">便是</span>为了给HTML页面添加样式，CSS设置样式是<span style="color: black;">经过</span>CSS<span style="color: black;">选取</span>器进行<span style="color: black;">掌控</span>，CSS<span style="color: black;">选取</span>器<span style="color: black;">便是</span>用于指向<span style="color: black;">必须</span>CSS<span style="color: black;">功效</span>的标签，让CSS样式<span style="color: black;">晓得</span>自己<span style="color: black;">必须</span><span style="color: black;">功效</span>到哪个标签上去。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CSS的<span style="color: black;">选取</span>器分为两大类：基本<span style="color: black;">选取</span>器和扩展（高级）<span style="color: black;">选取</span>器。</p>
<h2 style="color: black; text-align: left; margin-bottom: 10px;">基本<span style="color: black;">选取</span>器</h2>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">标签<span style="color: black;">选取</span>器：针对一类标签</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">ID<span style="color: black;">选取</span>器：针对某一个特定的标签<span style="color: black;">运用</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">类<span style="color: black;">选取</span>器：针对你想要的所有标签<span style="color: black;">运用</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">通用<span style="color: black;">选取</span>器（通配符）：针对所有的标签都适用（不<span style="color: black;">意见</span><span style="color: black;">运用</span>）</p>
<h2 style="color: black; text-align: left; margin-bottom: 10px;">高级<span style="color: black;">选取</span>器</h2>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">后代<span style="color: black;">选取</span>器：用空格</p>
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