點評：html5中的Web Storage包括了兩種存儲方式：sessionStorage和localStorage。sessionStorage用于本地存儲一個會話（session）中的數據，這些數據只有在同一個會話中的頁面才能訪問并且當會話結束后數據也隨之銷毀

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if(window.localStorage){
alert("瀏覽支持localStorage")
}
else
{
alert("瀏覽暫不支持localStorage")
}
//或者 if(typeof window.localStorage == 'undefined'){ alert("瀏覽暫不支持localStorage") }

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sessionStorage.setItem("key", "value");
localStorage.setItem("site", "js8.in");

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var value = sessionStorage.getItem("key");
var site = localStorage.getItem("site");

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sessionStorage.removeItem("key");
localStorage.removeItem("site");

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sessionStorage.clear();
localStorage.clear();

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var storage = window.localStorage; storage.key1 = "hello";
storage["key2"] = "world";
console.log(storage.key1);
console.log(storage["key2"]);

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var storage = window.localStorage;
for (var i=0, len = storage.length; i < len; i++)
{
var key = storage.key(i);
var value = storage.getItem(key);
console.log(key + "=" + value);
}

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if(window.addEventListener){
window.addEventListener("storage",handle_storage,false);
}
else if(window.attachEvent)
{
window.attachEvent("onstorage",handle_storage);
}
function handle_storage(e){
if(!e){e=window.event;}
}

PropertyTypeDescription

keyStringThe named key that was added, removed, or moddified

oldValueAnyThe previous value(now overwritten), or null if a new item was added

newValueAnyThe new value, or null if an item was added

url/uriStringThe page that called the method that triggered this change