abstract：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml&quo
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script src="js/jquery-3.4.0.min.js" type="text/javascript"></script>
<style type="text/css">
a{ float:left;
display:block;
margin:100px;
width:50px;
line-height:40px;
text-align:center;
height:50px;
border-radius:50px;
text-decoration:none;
}
</style>
</head>
<body>
<script type="text/javascript">
function aa(tag){
var len = document.getElementsByTagName(tag).length;
for (var i = 0 ;i<len;i++){
document.getElementsByTagName(tag)[i].style.backgroundColor='rgb('+Math.floor(Math.random()*256)+','+Math.floor(Math.random()*256)+','+Math.floor(Math.random()*256)+')';
}
}
//放入javascript代码或者jQuery代码
$("document").ready(function() {
aa("a");
$("a").mouseover(function(){
$bg = $(this).css("backgroundColor");
$(this).css("box-shadow","0px 0px 40px "+$bg);
$(this).css("border-radius","20px ");
});
$("a").mouseleave(function(){
$(this).css("box-shadow","none");
$(this).css("border-radius","50px ");
});
});
</script>
<a href="#">1</a>
<a href="#">2</a>
<a href="#">3</a>
<a href="#">4</a>
</body>
</html>