用js(javascript)完成点击一个按钮会使相应的div背景颜色发生改变
<!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" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>文档标题</title>
<style type="text/css">
*{margin:0;padding:0;}
#con{width:500px;height:500px;background:pink;border:1px solid #000;margin:100px auto;}
#blue{background:blue;}
#green{background:green;}
#red{background:red;}
</style>
</head>
<body>
<div id="con">
<button id="blue">蓝色</button>
<button id="green">绿色</button>
<button id="red">红色</button>
</div>
</body>
</html>
<script type="text/javascript">
var blue = document.getElementById('blue');
var con = document.getElementById('con');
blue.onclick = function(){
con.style.background = 'blue';
}
var green = document.getElementById('green');
green.onclick = function(){
con.style.background = 'green';
}
var red = document.getElementById('red');
red.onclick = function(){
con.style.background = 'red';
}
</script>
1.开始的页面如图所示：
2.当单机“蓝色按钮”下面的背景颜色变为蓝色
3.当单机“绿色按钮”下面的背景颜色变为绿色
4.当单机“红色按钮”下面的背景颜色变为红色
