str.trim.js

//trim vs
var t = 10, txt='\n adf '+document.body.innerHTML;

txt += txt + 'a \t';

console.time(1);
for (var i=0;i<t;i++){
(function( text ) {
  return (text || "").replace( /^\s+|\s+$/g, "" );
})(txt);
}
console.timeEnd(1);

console.time(2);
for (var i=0;i<t;i++){
(function( text ) {
  text = (text || "").replace( /^\s+/, "" );
var l = text.length - 1;
while(' \t\n\f'.indexOf(text.charAt(l)) > -1){
l-=1;
}
return text.substr(0, l+1);
})(txt);
}
console.timeEnd(2);