小编Smu*_*lix的帖子

我是JavaScript的新手,我希望你可以帮助我,就像在主题,null属性.

var add = document.getElementById('addition').checked;
var subs = document.getElementById('substraction').checked;
var multi = document.getElementById('multiplication').checked;
var div = document.getElementById('division').checked;

var result = 0;
    var x = parseInt(document.getElementById('firstNumber').value);
    var y = parseInt(document.getElementById('secondNumber').value);

function calculator() 
{
    if (add)
    {
        result = addition(x, y);
    }
    else if (subs)
    {
        result = substraction(x, y);
    }
    else if (multi)
    {
        result = multiplication(x, y);
    }
    else if (division)
    {
        result = division(x, y);
    };
}


<fieldset>
    <legend>Method</legend>
    <p><label><input type="radio" name="method" id="addition" />Addition</label></p>
    <p><label><input type="radio" name="method" id="substraction" />Substraction</label></p> …