[TOC]
underscore.js
中文文档：http://www.css88.com/doc/underscore/
Underscore提供的60多个函数：
**Collections（集合） **
each, map, reduce, reduceRight, find, filter, reject, all, any, include, invoke, pluck, max, min, sortBy, groupBy, sortedIndex, shuffle, toArray, size
**Arrays（数组） **
first, initial, last, rest, compact, flatten, without, union, intersection, difference, uniq, zip, indexOf, lastIndexOf, range
**Functions（函数） **
bind, bindAll, memoize, delay, defer, throttle, debounce, once, after, wrap, compose
**Objects（对象） **
keys, values, functions, extend, defaults, clone, tap, isEqual, isEmpty, isElement, isArray, isArguments, isFunction, isString, isNumber, isBoolean, isDate, isRegExp, isNaN, isNull, isUndefined
**Utility（功能） **
noConflict, identity, times, mixin, uniqueId, escape, template
Chaining
chain, value