在 Mac 中要如何使用 page up/down 呢??

A great tip submitted by Kev: A quicker page down and page up! This is especially faster on portables and the new wireless iMac keyboard where you have to press "Function - down arrow" or "Function - up arrow" as a page down/page up. It works in a lot of applications, as long as you are not currently in a text box (it doesn't work in Pages for that reason). I tried it in Mail, Safari, Firefox and Camino and it was all fine. To go down, you can simply hit "Space Bar" and you can go up with "Shift - Space Bar". It works very well and it is, nearly all the time, so much faster. I actually use it on my full size keyboard. Thanks for the tip Kev!