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));      

}