javascript take value from array

问题:

form name="car" onsubmit="return validate()"
input type=text name=input[][] value......

how can I alert value from filed input that is an field array?

    function validate(){
    alert("meee");
    var mycar = document.car.elements(input).value; // this line does NOT want to store value in mycar
    alert(mycar);
    }

in this case alert box with message mee is displayed but another box that should display value mycar is not displayed.

回答1:

Well, just use square brackets:

document.car.elements['input[][]'].value;