d3 multi line graph

[링크 : https://beta.observablehq.com/@mbostock/d3-multi-line-chart]

d3.v4

d3.line 

[링크 : https://bl.ocks.org/d3noob/4db972df5d7efc7d611255d1cc6f3c4f]

[링크 : https://codepen.io/zakariachowdhury/pen/JEmjwq]

d3 3.5.3

[링크 : https://bl.ocks.org/larsenmtl/e3b8b7c2ca4787f77d78f58d41c3da91]

+ 2018.11.22

[링크 : http://bl.ocks.org/hunzy/11110940] grid