说明：  编写Applet程序在画出一条两个周期的正弦曲线，要求： 1）画出坐标系，坐标系在applet窗口的中央,作图区域的大小通过html文件传递 2）曲线的颜色为红色，坐标系为绿色，有刻度
(Write Applet program to draw a two-cycle sine curve, requires: 1) Draw a coordinate system, coordinate system in the applet window, central, mapping the size of the region to pass through the html file 2) curve for the red color, coordinate system green, there are scale)