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动态地将升序ID附加到元素

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<p class="xyz">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer ac lectus ac sapien cursus ullamcorper. Proin facilisis accumsan ante, at iaculis magna aliquam consectetur.</p>

<p class="abc">Lorem ipsum</p>
<p class="xyz">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer ac lectus ac sapien cursus ullamcorper. Proin facilisis accumsan ante, at iaculis magna aliquam consectetur.</p>

<p class="abc">Lorem ipsum</p>
<p class="xyz">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer ac lectus ac sapien cursus ullamcorper. Proin facilisis accumsan ante, at …
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