可以把代码共享下吗？
<!DOCTYPE html>
<html manifest="sample.appcache">
<head>
<meta charset="UTF-8">
<title>ddd</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<img src="1.png">
<img src="3.png">
<script>
//监控
window.onload = function(){
window.applicationCache.onupdateready = function(e){
console.log(window.applicationCache.status);
if(window.applicationCache.status == window.applicationCache.UPDATEREADY){
window.applicationCache.swapCache();
if(confirm('版本更换，是否确认加载？要重新刷新两次')){
window.location.reload();
}
}else{
console.log('manifest did not change');
}
}
}
</script>
</body>
</html>