polyline元素如何在始末加个圆点或箭头
就是起点哪里是个黑色的小圆点，结束那里是个箭头！！
求赐教！！
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参见
http://apike.ca/prog_svg_patterns.html
http://www.w3.org/TR/SVG/painting.html
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既然你不爱看文档，那我给你2个例子总行了吧？
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<svg id="root" width="800" height="600" viewBox="0 0 800 600" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>svg</title>
<defs>
<marker id="markerEndArrow"
viewBox="0 0 30 30" refX="10" refY="12.5"
markerUnits="strokeWidth" markerWidth="9" markerHeight="30"
orient="auto">
<path style="stroke-
width:1;stroke:black;fill:black;opacity:1" d="M0.3125 0.625 9.3125
12.625 0.3125 24.625 21.3125 12.625 Z" />
</marker>
</defs>
<line style="marker-end:url(#markerEndArrow);stroke-
width:5;stroke:brown;fill:none;" x1="325" x2="660" y1="535" y2="200"/>
<line style="marker-end:url(#markerEndArrow);stroke-
width:2;stroke:brown;fill:none;" x1="125" x2="560" y1="435" y2="100"/>
</svg>