​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>本例使用 addEventListener() 方法将 "mouseover" 和 "mouseout" 事件附加到 h1 元素。</p>
​
<h1 id="demo">请把鼠标悬停在我上面</h1>
​
<script>
document.getElementById("demo").addEventListener("mouseover", mouseOver);
document.getElementById("demo").addEventListener("mouseout", mouseOut);
​
function mouseOver() {
  document.getElementById("demo").style.color = "red";
}
​
function mouseOut() {
  document.getElementById("demo").style.color = "black";
}
</script>
​
</body>
</html>
​