解决 iframe 中不能使用 Clipboard API 的问题

当在 iframe 中使用 Clipboard API 是时候会报下面的错误
The Clipboard API has been blocked because of a permissions policy applied to the current document
导致问题的原因是 iframe 的 CSP 安全机制，解决办法通过 allow 属性明确告知我们需要的权限，见下面的代码

</code></pre>
<br>
<p><em>PS：相对 <code>clipboard-write</code> 的另一个权限是 <code>clipboard-read</code></em></p>
						  
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