普通的 html 代码
[js]
<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>jQuery</title>
<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script>
var maxNum = 100;
$(document).ready(function() {
$('.counter').text(maxNum);
$('#status').bind({
keyup: function() {
...