html5 有两种缓存
1、localStorage：浏览器关闭后，数据库还存在。
2、sessionStorage：session缓存，浏览器关闭后，数据已经不存在。
实例一：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>
实例二：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>