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我正在尝试使用构建以下内容createDocumentFragment()并将其附加到document.body. 我通常的做法是通过它来引用一个元素id。既然这里没有'ids，我该如何构建这样的东西？

<div class="Mh0NNb VcC8Fc" style="visibility:visible;">
    <div class="M6tHv">
        <div class="aGJE1b">Success</div>
        <div class="dnmu6e"></div>
        <div class="x95qze">Close</div>
        <div class="dnmu6e"></div>
    </div>
</div>

frag = document.createDocumentFragment();

n = document.createElement('div')
n.setAttribute('class','Mh0NNb VcC8Fc')
frag.appendChild(n)

n = document.createElement('div')
n.setAttribute('class','M6tHv')
a = frag.getElementsByClassName('Mh0NNb') // This seems to not work
frag.appendChild(a)
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