<html>
<body>
<p>使用 the addEventListener() 方法向文档添加许多事件。</p>
<p id="demo"></p>
<script>
document.addEventListener("mouseover", myFunction);
document.addEventListener("click", mySecondFunction);
document.addEventListener("mouseout", myThirdFunction);
function myFunction() {
document.getElementById("demo").innerHTML += "Moused over!<br>"
}
function mySecondFunction() {
document.getElementById("demo").innerHTML += "Clicked!<br>"
}
function myThirdFunction() {
document.getElementById("demo").innerHTML += "Moused out!<br>"
}
</script>
</body>
</html>