代码示例:(标识:js_callback_9)
<!DOCTYPE html>
<html>
<body>

<h1>JavaScript SetTimeout()</h1>

<p>等待 3 秒(3000 毫秒)让此页面发生变化。</p>

<h1 id="demo"></h1>

<script>
setTimeout(function() { myFunction("I love You !!!"); }, 3000);

function myFunction(value) {
  document.getElementById("demo").innerHTML = value;
}
</script>

</body>
</html>
运行结果: