说明：  做的一个applet,才有随机数作为数据源,运行得到实时动态多条曲线的绘制.注意首先要按照好jdk,并且设置环境变量,事先下载好需要的JAR包,需要用到javaxsevlets,javaxhttpsevlet，网上都是可以免费下载的 运行效果很好
(Do one applet, only a random number as a data source, run to get real-time dynamic multiple curve drawing. Attention first of all to follow good jdk, and set the environment variable, you need beforehand downloaded JAR package, need to use javaxsevlets, javaxhttpsevlet, Internet is available for free download to run with good results)