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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>PWA应用</title>
<link rel="manifest" href="./manifest.json">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<link rel="apple-touch-startup-image" href="//webmap1.bdimg.com/mobile/simple/static/common/images/startup_320_460_96280c8.jpg">
<link rel="apple-touch-icon" sizes="180x180" href="//webmap1.bdimg.com/mobile/simple/static/common/images/map-logo-180_eb76f71.png">
<link rel="stylesheet" href="./css/index.css">
</head>
<body>
<!-- 设计一个shell 壳；只是一个概念，并没有什么新技术 -->
<header></header>
<main>
.......
</main>
<footer></footer>
<img src="./images/马赛克拼图.jpeg" alt="" width="450px" height="450px">
<script src="./js/index.js"></script>
<script src="./js/test.js"></script>
<script>
//判断是否具备实现PWA的能力
if("serviceWorker" in navigator){
//第一次是null，生效了才会有值的
console.log('当前的控制权',navigator.serviceWorker.controller);
//注册sw.js，把控制权交给sw.js文件
navigator.serviceWorker.register('./sw.js')
.then((registration)=>{
//需要启动一个服务
console.log('serviceWorker注册成功，范围为：',registration.scope);
}).catch((err)=>{
console.log('serviceWorker注册失败，错误详情：',err);
})
}
</script>
</body>
</html>