其实提供的接口很简单，localStorage 和 sessionStorage 的用法是一样的。
-
设置数据：setItem(name, value)
-
获取数据：getItem(name)
-
删除键值：removeItem(name)
-
删除所有键值：clear()
例如：
localStorage.setItem('name', 'wenzhixin');
localStorage.getItem('name'); //'wenzhixin'
localStorage.removeItem('name');
localStorage.clear();
当然，你也可以使用普通的对象用法：
localStorage.name = 'wenzhixin';
localStorage['name'] = 'wenzhixin';
localStorage.name; //'wenzhixin'
localStorage['name']; //'wenzhixin'
delete localStorage.name;//删除键值
delete localStorage['name'];//删除键值
在实际使用中，会先将数据转换为 JSON，作为字符存储，如：
localStorage[name] = JSON.stringify(value); //存储
JSON.parse(localStorage[name]); //读取
--------------------------------------
if(typeof(Storage)!=="undefined")
{
localStorage.lastname="Smith";
document.getElementById("result").innerHTML="Last name: " + localStorage.lastname;
}
else
{
document.getElementById("result").innerHTML="Sorry, your browser does not support web storage...";
}