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<!DOCTYPE html> <html> <body> <h1>Window 对象</h1> <h2>setTimeout() 方法</h2> <p>等待 5 秒的问候语：</p> <h2 id="demo"></h2> <script> const myTimeout = setTimeout(myGreeting, 5000); function myGreeting() { document.getElementById("demo").innerHTML = "Happy Birthday！" } </script> </body> </html>