split方法按照给定规则分割字符串，返回一个由分割出来的子字符串组成的数组'it|sxt|zifuchuan'.split('|')//["it","sxt","zifuchuan"]如果分割规则为空字符串，则返回数组的成员是原字符串的每一个字符。'a|b|c'.split('')//["a","|","b&q