<html><body><p>在此示例中，setInterval() 方法每 300 毫秒执行一次 setColor() 函数，这将在两种背景颜色之间切换。</p><button onclick="stopColor()">停止切换</button><script>var myVar = setInterval(setColor, 300); function setColor() { var x = document.body; x.style.backgroundColor = x.style.backgroundColor == "yellow" ? "pink" : "yellow";} function stopColor() { clearInterval(myVar);}</script></body></html>