Here you can find the source of trim()
String.prototype.trim = function(){ return this.replace(/^(\s|\u00A0)+/,'').replace(/(\s|\u00A0)+$/,''); }
String.prototype.trim = function( ext ) var chars = [ " ", "\t", "\n", "\r" ]; var s = this.copy(); if( arguments.length > 0 ){ for( var i in ext ){ chars.push( ext[i] ); ...
String.prototype.trim = (function() { var trimRegex = /(^\s+|\s+$)/g; return function() { return this.replace(trimRegex, ''); }; }());
String.prototype.trim = (function() { var trimRegex = /(^\s+|\s+$)/g; return function() { return this.replace(trimRegex, ''); };
String.prototype.trim = function(){ return this.replace(/(^[\\s]*)|([\\s]*$)/g, "");
String.prototype.trim = function trim() { return this.replace(/^\s+|\s+$/g, ''); };
String.prototype.trim = function () { return this.replace(/^\s+|\s+$/g, "");
String.prototype.trim = function () { return this.replace(/^\s+|\s+$/, ""); };
'use strict'; String.prototype.trim = function(){ return /^\s*([\d\D]*?)\s*$/.exec(this)[1]; };
String.prototype.trim=function(){ return this.replace(/^\s+|\s+$/g,"");