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<!DOCTYPE html> <html> <body> <h2>JavaScript SetTimeout()</h2> <p>等待 4 秒（4000 毫秒），此页面将发生变化。</p> <h1 id="demo"></h1> <script> setTimeout(myFunction, 4000); function myFunction() { document.getElementById("demo").innerHTML = "I love You !!"; } </script> </body> </html>