在本学习中，主要使用div对事件进行了分区，代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>关于JavaScript事件</title>
<style>
body{
background: black;
}
div,h3{
color: white;
/* box-align: center; */
}
#red{
color: red;
}
</style>
</head>
<body>
<div>
<div>这是一行字</div>
<h3>被定义了id的p</h3>
<div id="red">
<p>这是一行字</p>
</div>
<h3>在div中添加鼠标移动/移除事件</h3>
<div style="width:80px;height:60px;background-color: skyblue;">
<h3 onmouseover="moverDemo(this)" onmouseout="movoutDemo(this)" onclick="this.innerHTML='已点击'">点击</h3>
</div>
</div>
<script>
function moverDemo(obj){
obj.innerHTML="谢谢";
}
function movoutDemo(obj){
obj.innerHTML="点击";
}
</script>
</body>
</html>