HTML5 offline apps and caches

1 Localstorage and Sessionstorage

Sessionstrage:session that is the meaning of the session, where a user browsing a website, from the site to close the site this time period, the session object is only so long. Localstorage: Save the data on the client hardware device, no matter what it is, it means that the data will be there the next time you turn on the computer. The difference is a temporary save, a possession for a long term.

2 Local Database

using the Sqllite database requires two necessary steps: Create a database Access object to create objects using transactions: OpenDatabase (DbName, version, Dbdesc, size) actual access: Db.transaction ( function () {tx.excutesql ('create Table ... ' );}); Data query: Excutesql (SQL, [], DataHandler, ErrorHandler)// back two for callback function; [] estimated to be SQL injection processing

3 manifest file

1 Recommended name suffix named. appcache

<! DOCTYPE html>
　　
　　
2 web-inf/Web. xml file is  set. <mime-mapping>    <extension>appcache</extension>    <mime-type>text/cache-manifest </mime-type>  
3 Demo.appcache as follows

/current project name/
/current project name/
4 The first visit of the viewer will automatically print the cache log


 
HTML5 offline apps and caches