效果图
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title></title>
</head>
<body>
<button id="button">点击显示通知内容</button>
<p id="text"></p>
<script type="text/javascript" charset="utf-8">
if (window.Notification) {
var button = document.getElementById('button'),
