<!DOCTYPE html> <html> <body> <h1>Window 对象</h1> <h2>clearTimeout() 方法</h2> <p>点击按钮可防止超时执行。(你有 3 秒)。</p> <h2 id="demo"></h2> <button onclick="myStopFunction()">停止</button> <script> const myTimeout = setTimeout(myGreeting, 3000); function myGreeting() { document.getElementById("demo").innerHTML = "生日快乐!" } function myStopFunction() { clearTimeout(myTimeout); } </script> </body> </html>