JavaScript 
标准参考教程
第五篇

数组

typeof [],
'object',
数组和对象

length,
array.length = 0,
array.length += 1

空位
array = [, , ,]
delete array[0]
array = [undefined]
forEach / for in / Object.keys

for in,
遍历索引和全部属性

Array,
var a = new Array()
var b = new Array(2)
var c = new Array(2, 3)

常用方法,
indexOf,concat,slice,join
push,pop,shift,unshift
sort,reverse
forEach,map,filter,reduce,every

伪数组,
arguments,
$('#some_div'),
document.querySelectorAll,
[].slice.call

结束
http://javascript.ruanyifeng.com/grammar/array.html
