阳光上的桥的回答

trim用来把字符串前后的空白去处，删除以下内容：

" " (ASCII 32 (0x20)), an ordinary space.
"\t" (ASCII 9 (0x09)), a tab.
"\n" (ASCII 10 (0x0A)), a new line (line feed).
"\r" (ASCII 13 (0x0D)), a carriage return.
"\0" (ASCII 0 (0x00)), the NUL-byte.
"\x0B" (ASCII 11 (0x0B)), a vertical tab.

ufxin123的回答

我只能告诉你trim函数的作用，
trim()取消字符串前后空格的
最常用的地方是给数据库传值用的
我只懂这么多