就好比说分别用直线，虚线，和星号线来表示

<img src="https://img.jishulink.com/upload/201711/1510725293129_blob.png" title="blob.png" style="max-width:760px;" alt="blob.png"/>"Plot[{Sin[x], Sin[2 x], Sin[3 x], Sin[4 x]}, {x, 0, 2 Pi}, PlotStyle -> {Thick, Dashed, DotDashed, Dotted}]"