What does x.length do in JavaScript?

I am doing this JavaScript math question where it asks me his math question. I do the math, type the answer in the box, and sumbit it. If i am ri开发者_开发百科ght I move on but I got lost at x.length. I don't know what that means. Here is a example of the problem:

var a= 5+6*4
var b= a / 9
Function (x)
(
        if (x.length == b)

This is what he is after... most likely..

var foo = 5 + 6 * 7 
var bar = foo % 8
var moo = bar * 2
var rar = moo / 3
function check(x)
{
        if (x.length == moo)
        {
                        alert("win!");
                        window.location += "?lvl_password="+x;
        } else {
                        alert("fail D:");
     }
}

It's a mission in hackthissite.org to break a javascript password login

I agree with Robusto: this is a broken code. However, x.length can mean one of three things:

• the number of items in an array;
• the number of characters in a String;
• the number of digits in an integer;

and more.