after using a page object
(e.g., the Result page object), Tapestry will not throw it away. Instead, it will put it into a pool for reuse (see the diagram
below). Later when it needs to use the Result page object again, it will check if the pool has one. If so, just take it out
from the pool and use it. Only when the pool has no such page object, will it create a new page object.
所以如果在一個(gè)新開(kāi)的瀏覽器上面，頁(yè)面上顯示的參數(shù)不會(huì)發(fā)生改變，
防止這種情況的發(fā)生可以
在page-specification中加入
<property name="XXX"> XXX為頁(yè)面上的變量
所以對(duì)應(yīng)的頁(yè)面為抽象的類 abstract，
對(duì)應(yīng)的變量的get，set方法為abstract