AS支除兩邊的空格

/***************Public Function******************/
function LTrim(str:String):String {
    var _s:String = str;
    var _len:Number = _s.length;
    var _char:String;
    var i:Number = -1;
    while (++i<_len) {
        _char = _s.substr(i, 1);
        if (_char != " " && _char != "\n" && _char != "\f" && _char != "\r" && _char != "\t") {
            return _s.substr(i, _len-i);
        }
    }
}

function RTrim(str:String):String {
    var _s:String = str;
    var _len:Number = _s.length;
    var _char:String;
    var i:Number = _len;
    while (--i>0) {
        _char = _s.substr(i, 1);
        if (_char != " " && _char != "\n" && _char != "\f" && _char != "\r" && _char != "\t") {
            return _s.substr(0, ++i);
        }
    }
}

function Trim(str:String):String {
    return LTrim(RTrim(str));
}