怎么改变矢量场图的箭头类型（Mathematica）

1、把矢量改为绿色。VectorPlot[{Sin[y]*觊皱筠桡Cos[x + t], Cos[x]*Sin[y + t]},{x, -3, 3}荑樊综鲶, {y, -3,3}, VectorStyle -> Green]

3、双向箭头：VectorStyle -> {"ArrowArrow", Green}

5、把箭头变成圆：VectorStyle -> {Arrowheads[{{0.03, 1, Graphics[Circle[]]}}], Green}

7、箭头变成箭头，箭尾变成圆。VectorStyle -> {Arrowheads[{{0.03, 1}, {0.01, 0, Graphics[Circle[]]}}],Green}