获取时钟相对于实际时间的当前前进速率。
Gets the rate at which the clock's time is currently progressing, compared to real-world time.
如果站点使用Ajax更新的速率过快，用户可能会以为后退和前进按钮以及书签出现了问题。
Users might perceive the Back and Forward buttons and bookmarks to be broken if a site is updated too often with Ajax.
如果站点使用Ajax更新的速率过快，用户可能会以为后退和前进按钮以及书签出现了问题。
Users might perceive the Back and Forward buttons and bookmarks to be broken if a site is updated too often with Ajax.
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