1.split("分割条件(正则表达式或者字符)") 字符串 ==> 数组

默认返回数组

(1) 将单词分割为字符

"hello".split("")	//可返回 ["h", "e", "l", "l", "o"]

(2)将句子分割为单词

var words = sentences.split(' ') 

(3)去除字符串中的间隔符号,比如: = | 等

"2:3:4:5".split(":")    //将返回["2", "3", "4", "5"]
"|a|b|c".split("|")    //将返回["", "a", "b", "c"]