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<!DOCTYPE html> <html> <head> <style> button { font-size: 15px; padding: 5px 15px; } dialog::backdrop { background-color: #1fc8db; /* 用于不支持渐变的浏览器 */ background-image: linear-gradient(140deg, #EADEDB 0%, #BC70A4 50%, #BFD641 75%); opacity:0.75; } </style> </head> <body> <h1>::backdrop 演示</h1> <p>点击按钮显示对话框：</p> <button id="dialogBtn">显示对话框</button> <dialog id="myDialog"> <form method="dialog"> <p>此对话框的背景是一个 backdrop。</p> <button id="confirmBtn">关闭对话框</button> </form> </dialog> <script> const dialogBtn = document.getElementById('dialogBtn'); const myDialog = document.getElementById('myDialog'); dialogBtn.addEventListener('click', () => myDialog.showModal()); </script> </body> </html>