javascript - OnChange does not work on radio buttons

I do not know why the onchange function does not trigger if I Switch the Radio Buttons.

I only get the console message if I click on each Radio the first time, but after switching the Radio I do not the a console Output.

var drawingArrow = document.getElementById('drawing-arrow-shape'),

    drawingCircle = document.getElementById('drawing-circle-shape'),

drawingCircle.onchange = function() {
    console.log("on change circle btn");
};

drawingArrow.onchange = function() {
    console.log("on change arrow btn");
};