flex 客户端缓存SharedObject

usernameSO = SharedObject.getLocal(‘username‘);
                    if (usernameSO)
                    {
                        usernameSOAL = usernameSO.data[‘username‘] as ArrayList;
                        if(usernameSOAL)
                        {
                            var u:Object=usernameSOAL.getItemAt(0);
                            username.text=u.username;
                        }
                    }

var u:Object=new Object();
                    u.username=n;
                    var array:ArrayList=new ArrayList();
                    array.addItem(u);
                    usernameSO.data[‘username‘]=array;
                    usernameSO.flush();