完成jQuery随机背景颜色动画案例
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript" src="jquery-3.3.1.js"></script>
<style type="text/css">
a{ color: red;
width: 100px;
height: 100px;
display: block;
background-color: #ccc;
float: left;
margin-left: 30px;
line-height: 100px;
text-align: center;
text-decoration: none;
border-radius: 50px;
}
</style>
<script type="text/javascript">
function change(tag) {
var leng=document.getElementsByTagName(tag).length;
for(var i=0;i<leng;i++)
{
document.getElementsByTagName(tag)[i].style.backgroundColor = 'rgb(' + Math.floor(Math.random()*256)+','+ Math.floor(Math.random()*256)+',' +Math.floor(Math.random()*256)+')'
}
}
$(document).ready(function(){
change('a');
$('a').mouseover(function(){
$bg = $(this).css('backgroundColor');
$(this).css("box-shadow","0px 0px 20px "+$bg);
$(this).css("border-radius","20px");
})
$('a').mouseleave(function(){
$bg = $(this).css('backgroundColor');
$(this).css("box-shadow","none");
$(this).css("border-radius","50px");
})
})
</script>
</head>
<body>
<a href="#">a</a>
<a href="#">b</a>
<a href="#">c</a>
<a href="#">d</a>
</body>
</html>
经过本案例学习发现dom的功能好强大，课外还需要多多练习让dom里的功能运用到得心应手。
