<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>发布-订阅模式示例</title>
<style>
#responseArea {
white-space: pre-wrap;
min-height: 100px;
border: 1px solid #ccc;
padding: 10px;
margin-top: 20px;
}
</style>
</head>
<body>
<h1>发布-订阅模式示例</h1>
<button onclick="addEvent('myEvent')">订阅事件myEvent，打印 1+ 接收到的数据</button>
<!-- 验证订阅是否成功[打印:1+first] -->
<button onclick="publishEvent('first')">发布事件myEvent，发送数据:first</button>
