String[] split(String regex, int limit)
public String[] split(String regex, int limit)
其中regex为分割正则表达式，limit为分割次数限制;
limit=1时：表示把字符串分割成1份
String[] strLst = "1,2,3,4,".split(",", 1); --> [1,2,3,4,]
limit=2时：表示把字符串分割成2份
String[] strLst = "1,2,3,4,".split(",", 2); --> [1, 2,3,4,]
limit=5时：表示把字符串分割成5份
String[] strLst = "1,2,3,4,".split(",", 5); --> [1, 2, 3, 4, ]
limit=6时：表示把字符串分割成6份、但是最多只能分5分、会自动分5分
String[] strLst = "1,2,3,4,".split(",", 6); --> [1, 2, 3, 4, ]
limit=0时：字符串被尽可能多的分割，但是尾部的空字符串会被抛弃
String[] strLst = "1,2,3,4,".split(",", 0); --> [1, 2, 3, 4]
limit < 0时：字符串被尽可能多的分割，而且尾部的空字符串不会被抛弃
String[] strLst = "1,2,3,4,".split(",", -1); --> [1, 2, 3, 4, ]
String[] strLst = "1,2,3,4,".split(",", -2); --> [1, 2, 3, 4, ]
String[] split(String regex)
String[] split(String regex)
对于没有 limit 参数的 split函数，等价于 limt = 0 的情况，尾部的空字符串被舍弃掉：
String[] strLst = "1,2,3,4,".split(","); --> [1, 2, 3, 4]
