Measuring performance for string reverse in javascript

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String.prototype.reverse1 = function(){
	return this.split("").reverse().join("");
}


String.prototype.reverse2 = function(){
	var i, j=0, reversed = "";
	var ttmp=new Array();
	for (i = this.length-1; i >= 0; i--) {
		ttmp[j++] = this.charAt(i);
	}
	return ttmp.join("");
}


String.prototype.reverse3 = function(){
	var i, reversed = "";
	for (i = this.length-1; i >= 0; i--) {
		reversed += this.charAt (i);
	}
	return reversed;
}