删除字符串两端的空白字符。

返回值:String

参数:

• str (String): 要删除空白字符的字符串

示例:

$.trim(" hello, how are you? ");

结果:

"hello, how are you?"

Remove the whitespace from the beginning and end of a string.

Return value: String
Parameters:

• str (String): The string to trim.

Example:

 $.trim("  hello, how are you?  ");  

 "hello, how are you?"