html5 有兩種快取
1、localStorage：瀏覽器關閉後，資料庫還存在。
2、sessionStorage：session快取，瀏覽器關閉後，資料已經不存在。
例項一：localStorage
<!DOCTYPE HTML>
<html>
<body> <script type="text/javascript">
if (localStorage.pagecount)
{
localStorage.pagecount=Number(localStorage.pagecount) +1;
}
else
{
localStorage.pagecount=1;
}
document.write("Visits "+ localStorage.pagecount + " time(s).");
</script>
</body>
</html>
例項二：sessionStorage
<!DOCTYPE HTML>
<html>
<body> <script type="text/javascript"> if (sessionStorage.pagecount)
{
sessionStorage.pagecount=Number(sessionStorage.pagecount) +1;
}
else
{
sessionStorage.pagecount=1;
}
document.write("Visits "+ sessionStorage.pagecount + " time(s).");
</script>
</body>
</html>