What i want to do is, to show a message based on certain condition. So, i will read the database after a given time continuously, and accordingly, show the message to the user. But i want the message, to be updated only on a part of the page(lets say a DIV).What i want to do is, to show a message based o
阅读背景：
如何在给定时间后重新加载网页的一部分？
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