点击换色换内容
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>获取随机色</title>
<script type="text/javascript" src="http://ph7.shengqianku.cn/jquery-3.3.1.min.js"></script>
<style type="text/css">
a {
float:left;
display:block;
margin:50px;
width:100px;
line-height: 100px;
text-align: center;
height:100px;
color:#000;
border-radius: 50px;
text-decoration: none;
}
</style>
<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)+')'
}
}
$(document).ready(function(){
aa('a')
var u=0
$('button').click(function(){
aa('a')
u++
$('a').text(u)
})
})
</script>
</head>
<body>
<a href="#">1</a>
<a href="#">2</a>
<a href="#">3</a>
<a href="#">4</a>
<button>点击变色</button>
</body>
</html>
