Session variables without cookies

Session variables without cookies - 可以一直儲存一個變數直到該tab/window關閉，神奇不過不知道可以應用在哪。

Brilliant but terrifying hack—you can store up to 2 MB of data in window.name and it persists between multiple pages, even across domains. Doesn’t work with new tabs though, and storing JSON in it and eval()ing it is a bad idea—a malicious site could populate it before sending the user to you.

DOM:window.name - MDC

Gets/sets the name of the window.

Session variables without cookies
另外該作者的 undo library 也值得一看： Undo & redo in forms