<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}
div {
width: 100px;
height: 100px;
background-color: green;
float: left;
margin-left: 10px;
border: 5px solid green;
}
</style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
//获取所有的div标签
var divObjs = document.getElementsByTagName("div");
for (var i = 0; i < divObjs.length; i++) {
//为每个div添加鼠标进入的事件
divObjs[i].onmouseover = function () {
this.style.border = "5px solid red";
};
//为每个div添加鼠标离开的事件
divObjs[i].onmouseout = function () {
this.style.border = "";
};
}
</script>
</body>
</html>
