js writing trim() function and the use of regular expressions_javascript skills

1.js itself does not have a trim function, but you can write one yourself

2. 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 you need to write them 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();)