JavaScript 点击页面上的按纽，弹出层，背景变灰

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<title>点击页面上的按纽，弹出一个层，背景变灰</title>
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<p>点击页面上的按纽，弹出一个层，背景变灰点击页面上的</p></div></p><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" />
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