javascript 去字符串空格终极版(支持utf8)

/** 去字符两端空格 开始
*@author 敖士伟
*@version v1.0
*@date 2009/11/14 22:51
*/
String.prototype.trim = function() {
var r = this.replace(/(^\s*)|(\s*$)/g, "");
r = Lremoveblank(r);
r = Rremoveblank(r);
return r;
}

function Lremoveblank(s) {
if (s.length == 1 && s.charCodeAt(0) == 160)
return "";
if (s.charCodeAt(0) == 160) {
s = s.substr(1, s.length - 1);
return removeblank(s);
}
else {
return s;
}
}

function Rremoveblank(s) {
if (s.length == 1 && s.charCodeAt(0) == 160)
return "";
if (s.charCodeAt(s.length-1) == 160) {
s = s.substr(0, s.length - 1);
return Rremoveblank(s);
}
else {
return s;
}
}

//--去字符两端空格 结束

//e.g.
var a = "  a  ";
alert("b" + a.trim() + "b");