Javascript removes leading and trailing spaces from the string

<Script language = "JavaScript" type = "text/JavaScript"> // remove the space function ltrim (STR) {If (Str. charat (0) = "") {// if the first character on the left of the string is a space STR = Str. slice (1); // remove the space from the string // This sentence can also be changed to STR = Str. substring (1, str. length); STR = ltrim (STR); // recursive call} return STR;} // remove the space function rtrim (STR) {var ilength; ilength = Str. length; If (Str. charat (ilength-1) = "") {// if the first character on the right of the string is a space STR = Str. slice (0, ilength-1); // remove the space from the string // This sentence can also be changed to STR = Str. substring (0, ilength-1); STR = rtrim (STR); // recursive call} return STR;} // remove spaces on both sides of the string function trim (STR) {return ltrim (rtrim (STR) ;}</SCRIPT>