1、鼠标离开的状态
2、鼠标经过 我爱学习 字体由“红色”改变为“黄绿色”，此时鼠标离开—框框
3、鼠标经过 框框 时“浅蓝色”变为“黄绿色”,此时鼠标离开—我爱学习
代码编写如下；
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>鼠标移入时，改变字体的背景色，移出时，还原默认的背景色</title>
<style>
.xuexi{200px;height:120px;background:#abcdef;border:1px solid green;}
</style>
<script>
function aixuexi(){
var woaixuexi=document.getElementById("woaixuexi");
woaixuexi.style.background="yellowgreen";
}
function xuexi(){
var xuexi=document.getElementById("woaixuexi");
xuexi.style.background="#abcdef";
}
function ziti(){
var ziti=document.getElementById("font");
ziti.style.color="yellowgreen";
}
function zi(){
var ziti=document.getElementById("font");
ziti.style.color="red";
}
</script>
</head>
<body>
<h1 id="font" onmouseover="ziti();" onmouseout="zi();" class="ziti">我爱学习</h1>
<div id="woaixuexi" onmouseover="aixuexi();" onmouseout="xuexi();" class="xuexi"></div>
</body>
</html>