HTML5 Web Storage API

window.sessionStorage.setItem("myKey","myValue");

window.sessionStorage.getItem("myKey");

sessionStorage的作用域只是在浏览（在构建它的窗口或标签有效）当中有效，用户关闭浏览器后失效

    try    {
        if(!window.openDatabase){
            alert('Not Supported cs-db');
            }
        else{
            var shortName = 'noteDB';
            var verson = '1.0';
            var displayName = 'Note book database';
            var db = openDatabase(shortName,verson,displayName,65536);
        }    
    }
    catch(e)
    {
        if(e == 2){
            alert('Invalid database version,');
        }
        else
        {
            alert('Unknown error'+e+'.');    
        }
    }