the practice of dwr and echarts
这是个关于dwr 和 echarts的练习 dwr就相当于ajax，它能够直接在前端调用后台的方法。 dwr使用的每一个java类都需要在dwr.xml中配置 这次的练习是一个小demo，希望不懂的人能够知道如何去使用
在前端页面中 自定义了计时器和弹出框 window自带的alert弹出框每次弹出都会造成线程挂起，故需要自定义弹出框 使该线程不挂起，计时器能继续计时。
最后就是echarts 个人觉得非常好用的一个图表插件。
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