本小程序可显示直线、抛物线、椭圆、幂函数、三角函数等函数图像，也能画出参数方程、极坐标方程的的图像。程序运行后，只要你有想象力，输入任何函数（方程），单击刷新，函数图像就呈现在你面前了。-This applet can display the image of a straight line, parabola, ellipse and power function, trigonometric functions, can draw a parametric equation, polar equation of the image. The program is running, as long as you have imagination, to enter any function (equation), click the Refresh function images are displayed in front of you.