怎么通过xml文件，实现前台消息提示
如何通过xml文件，实现前台消息提示
最近做公司的一个项目，需要实现一个消息提示功能，准确说就是：当用户在前台通过购买或者消费，用户信息和金额发生变动后，在网站右下角会出现消息提示，详细描述了他所做的操作
再比如：用户在前台申请提款后，网站管理员在后台受理后，前台会弹出提示“取款已受理”，此弹出非windows弹出框，而是非常人性化的，很好看，很轻巧的一个提示框，在右下角显示出来！
看了公司给的一个范例，读代码后发现实现的方法是：用户在前台每次购买或者消费产生变动后，在存入数据库的同时也会写入到xml文件里，然后前台就会有提示。我想不明白的是，为什么xml文件的值改变了 前台的提示就相应的出现了，这个消息提示值，是怎么从xml里读到的？怎么触发它自动提示出来的？
我是刚毕业的大学生，刚参加工作，可能脑子比较笨，这个问题想了很久，还是想不明白通过xml怎么实现消息提示的
希望各位前辈和神仙姐姐，能帮忙开导下，谢谢！
------解决方案--------------------
可能前台使用了ajax,然后设定了定时器,估计用js的setInterval()函数
------解决方案--------------------
用户在前台每一个点击购买等操作，会跳转吧？
如果会，那载入新页的时候载入该XML文件。如果不跳转，那每次ajax提交购买操作的时候重新载入该XML文件。
不一定用setInterval()，用户有操作时就可以触发。
其实大概阅读一个它的Javascript代码就能看出端倪
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