How To Convert Binary To Decimal With Function

I am trying to convert binary to decimal with this function but it doesn't convert to decimal, but does decimal to binary.
Code:
function bin2dec() {
var x = document.getElementById("bin").value;
if ((/[^0-1]/g.test(x)) || x == "") {
alert ("You must enter an integer binary number!");
document.getElementById("bin").value = "";
document.getElementById("bin").focus();
return false;
}
x = parseInt(x);
var dec = x.toString(10);
var hex = x.toString(16).toUpperCase();
var octal = x.toString(8);
var figs = "The decimal representation of " + x + " is " + dec + "<br>";
figs = figs + "The hexadecimal representation of " + x + " is " + hex + "<br>";
figs = figs + "The octal representation of " + x + " is " + octal + "<br>";
document.getElementById("result").innerHTML = figs;
}