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" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="/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
