容导航
- dart:core - numbers, collections, strings, and more
- dart:async - asynchronous programming
- dart:math - math and random
- dart:html - browser-based apps
- dart:io - I/O for command-line apps
- dart:convert - decoding and encoding JSON, UTF-8, and more
- dart:mirrors - reflection
- Summary
http://dart.goodev.org/guides/libraries/library-tour#dartcore---numbers-collections-strings-and-more