Generate passwords with JavaScript

The function generatePassword() is a simple yet customizable function that generates a random password string, the default password length is 6, you can override it by calling the function like this  generatePassword(n) where n is the password length. The possible characters are defined within the function with the variable chars

function generatePassword(len){
	len	= parseInt(len);
	if(!len)
		len = 6;
	var password = "";
	var chars    = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	var charsN   = chars.length;
	var nextChar;

	for(i=0;i<len;i++){
		nextChar = chars.charAt(Math.floor(Math.random()*charsN));
		password += nextChar
	}
	return password;
}

Here is an example of calling the function:

pwdLen = 10;
window.alert("A random string of " + pwdLen + "characters: " + generatePassword(pwdLen));

Try it

Generate a random password of 8 characters.