npm run pretest 修改src代码,生成build/d3-force.js
npm run test 运行测试代码
npm run prepare d3-force库发布之前的准备,生成压缩之后的d3-force.min.js
d3-collection Handy data structures for elements keyed by string.
d3-dispatch Register named callbacks and call them with arguments.
d3-quadtree Two-dimensional recursive spatial subdivision.
d3-timer An efficient queue for managing thousands of concurrent animations.
d3-request A minimal, promise-based implementation to require asynchronous module definitions.
d3-selection Transform the DOM by selecting elements and joining to data.