js中的document.querySelector()的用法

在JavaScript中，document.querySelector()是一种DOM选择器方法，用于选择文档中与指定选择器匹配的第一个元素。此方法接受一个选择器作为参数，并返回匹配的第一个元素，如果没有匹配的元素，则返回null。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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