//实现点击一个按钮，alert一个小窗口
<!DOCTYPE html>
<html>
<head>
<title>jquery</title>
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
</head>
<body>
<button>click me</button>
<script>
$(document).ready(function(){
$('button').click(function(){
alert('hello jquery');
}) ;
});
</script>
</body>
</html>