​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>Window 对象</h1>
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<h2>setTimeout() 和 clearTimeout() 方法</h2>
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<p>单击“停止”可阻止 myGreeting() 执行。（你有 5 秒）</p>
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<button onclick="myStopFunction()">停止</button>
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<h2 id="demo"></h2>
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<script>
const myTimeout = setTimeout(myGreeting, 5000);
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function myGreeting() {
  document.getElementById("demo").innerHTML = "生日快乐！"
}
​
function myStopFunction() {
  clearTimeout(myTimeout);
}
</script>
​
</body>
</html>
​