SVG:polyline要素
points属性
Color、FillStroke、Graphics、Markers
<polyline points="60 30, 60 250, 100 250" /> 
p.svg<svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg">
<!-- Example of a polyline with the default fill -->
<polyline points="0,100 50,25 50,75 100,0" />
<!-- Example of the same polyline shape with stroke and no fill -->
<polyline points="100,100 150,25 150,75 200,0" fill="none" stroke="black" />
</svg>