Js custom trim function to delete spaces at both ends, jstrim

Js custom trim function to delete spaces at both ends, jstrim

This article describes how to delete spaces at both ends of a js custom trim function. We will share this with you for your reference. The details are as follows:

Compatible with low-version IE browsers and other browsers with low-version scripts

Js does not have trim functions.

// Delete the space function trim (str) {return str. replace (/(^ \ s *) | (\ s * $)/g, "");} // Delete the left space function ltrim (str) {return str. replace (/(^ \ s *)/g, "") ;}// Delete the right space function rtrim (str) {return str. replace (/(\ s * $)/g ,"");}

Or extend the String type attribute.

String. prototype. trim = function () {return this. replace (/(^ \ s *) | (\ s * $)/g, "");} var str = document. getElementById ("test "). value; alert (str. trim ());

Or simply give up using js and use jQuer$. Trim (str)

Var str = $ ("# test"). val (); alert ($. trim (str ));

PS: the regular expression operation is used in the example. Here we provide two very convenient Regular Expression tools for your reference:

JavaScript Regular Expression online testing tool:
Http://tools.jb51.net/regex/javascript

Regular Expression generation tool:
Http://tools.jb51.net/regex/create_reg