String.Prototype.trim = function () {Return this.replace (/ (^ / s *) | (/ s * $) / g, "!");
String.Prototype.ltrim = function () {Return this.Replace (/ (^ / s *) / g, "!");
String.prototype.rtrim = function () {Return this.Replace (/ (/ s * $) / g, "!");
Var str = "abc de";
Alert (str.trim ());
script>