1.入门教程
http://pkuwwt.github.io/d3-tutorial-cn/about.html
http://d3.decembercafe.org/pages/lessons/1.html
https://observablehq.com/
作者案例：https://bl.ocks.org/mbostock
2.中文手册
https://github.com/xswei/d3-force/blob/master/README.md#centering
3.力导向图
Modifying a Force Layout https://bl.ocks.org/mbostock/1095795