http://jsfiddle.net/doraeimo/JEcdS/

http://blog.csdn.net/k21325/article/details/68925611

http://www.tnoda.com/blog/2014-04-02

http://bl.ocks.org/duopixel/4063326

https://www.visualcinnamon.com/2016/01/animating-dashed-line-d3.html

http://bl.ocks.org/emeeks/068ef3e4106e155467a3

https://stackoverflow.com/questions/18165533/how-to-draw-a-line-link-between-two-points-on-a-d3-map-based-on-latitude-lon

https://www.sitepoint.com/d3-js-data-visualizations/

https://bost.ocks.org/mike/path/

https://bl.ocks.org/mbostock/5649592

https://bl.ocks.org/syntagmatic

https://christopheviau.com/d3list/

tree: http://bl.ocks.org/d3noob/8273682 http://bl.ocks.org/d3noob/8375092 https://bl.ocks.org/CrandellWS/ca7e6626c9e6b1413963