HTML5-WebStorageAPIs的简述

 function checkStorageSupport() { 
 //sessionStorage 
 
if
 (window.sessionStorage) { 
 alert('This browser supports sessionStorage'); 
 } 
else
 { 
 alert('This browser does NOT support sessionStorage'); 
 } 
 //localStorage 
 if (window.localStorage) { 
 alert('This browser supports localStorage'); 
 } else { 
 alert('This browser does NOT support localStorage'); 
 } 
}

 interface Storage { 
 //同源键值对的数目
 readonly attribute unsigned long length; 
 //通过索引获取键，索引从0开始
 getter DOM
String
 
key
(in unsigned long index); 
 //通过键获取值，键若不存在，值将返回
null
 getter any getItem(in DOMString key); 
 //存储键值对，若已存在同名键，则值将被覆盖。若用户关闭了浏览器存储或是已超 //过允许存储的最大值，都将产生QUOTA_EXCEEDED_ERR错误。
 
set
ter creator void setItem(in DOMString key, in any data); 
 //通过键删除值，不存在则什么也不做
 
delete
r void removeItem(in DOMString key); 
 //删除storage中所有键值对，若为空则什么也不做
 void 
clear
(); 
 };

 //---------------方式一--------------
 //存储数据
 window.sessionStorage.setItem(‘myFirstKey’, ‘myFirstValue’); 
 //读取数据
 alert(window.sessionStorage.getItem(‘myFirstKey’)); 
 //---------------方式二--------------
 //存储数据
 window.sessionStorage.myFirstKey = ‘myFirstValue’;
 //读取数据
 alert(window.sessionStorage.myFirstKey); 
 //---------------方式三--------------
 var varKey = sessionStorage.key(index);
 window.sessionStorage[varKey] = 
new
Value;

 window.addEventListener("storage", displayStorageEvent, true);

 interface StorageEvent : Event { 
 readonly attribute DOMString key; 
 readonly attribute any oldValue; 
 readonly attribute any newValue; 
 readonly attribute DOMString url; 
 //该方法提供了一个对发生storage事件对象的
引用
，这个对象可以是
 //sessionStorage或localStorage
 readonly attribute Storage storageArea;
 };

try
 {
 sessionStorage["name"] = "Tabatha";
 }
 catch (
exception
)
 {
 if (exception == QUOTA_EXCEEDED_ERR)
 { 
 // we should tell the user their quota has been exceeded. 
 }
 }