Solution to trim() using js_Basic knowledge

----------------------------------js remove spaces---------- --------------------------

Remove the spaces at the left and right ends of the string. You can easily use trim, ltrim or rtrim in vbscript. , but there are no these three built-in methods in js, and they need to be written manually. The following implementation method uses regular expressions, which is very efficient, and adds these three methods to the built-in methods of the String object.
　
The method format written as a class is as follows: (str.trim();)

　

can be written as a function like this: (trim(str))