脚本如下，比归档的算法更好理解，更适合我这样的初级Flash爱好者。
xa = xb;
ya = yb;
x += Math.PI/360;
xb = x*s;
yb = 200+a*Math.sin(x);
i++;
duplicateMovieClip(line, "line"+i, i);
eval("line"+i)._x = xa;
eval("line"+i)._y = ya;
eval("line"+i)._xscale = xb-xa;
eval("line"+i)._yscale = yb-ya;
