学习外国的框架，零零星星和点点滴滴是不行的，还是要有一个高屋建瓴总揽全局的看法，所以就看看D3都有哪些方法。

core：selection, transition, arrays, math, loading external resources, string formatting, csv formatting, localization(?), colors, Namesapce, Internal(?)

scales:quantitative, ordinal

svg:shapes, axex, control(局部)

time:formatting, scales, intervals

layouts:bubble, chord, cluster, force, hierarchy, histogram(直方图), pack, partition(分隔), pie, stack, tree, treemap

geograph:paths, projections(投影), streams

geometry(几何):voronoi(沃罗诺伊), quantree(四叉树), polygon(多边形), hull(船壳形状)

behaviors:drag, zoom