JavaScript rewrite trim ()

In Java, the trim () function represents the removal of the front and back spaces of a string, but there is no trim () function in JavaScript, so you need to override this function if you want to use it. Specific as follows:

function Trim (str) {  return str.replace (/(^\s*) | ( \s*$)/g, "");  }

Analyze the expression in replace.

The first//section is a regular expression:

^\s*:^ indicates that the match starts from the beginning, \s represents a white space character, * represents 0 or more;

\s*$:\s represents a blank, * represents 0 or more, and $ represents a match starting at the end;

|: Or, the requirements that indicate the beginning and end of the match are matched.

And the next G represents a global match.

JavaScript rewrite trim ()