Function JavaScript between popup.html and popup.js in chrome extension (taking into account message from Background)

I would like to execute function in chrome extension (in popup.js) by clicking on button in a innerHTML.

My code in popup.html is:

My code in popup.js :

chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) {
    if (msg.text === 'results') {
        var panier_container = document.getElementById("panier_container");

        var texte = "";
        panier_container.innerHTML = texte;
     });
});

function toto() {
    alert("toto");
}

When I execute the code, I see the button "TOTO" but when I click on the button, nothing happen. Out of chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) { the button execute the function. But inside no.