Prevent browser console

PreventF12.js

window.onload = function () {
document.addEventListener("contextmenu", function () {
        e.preventDefault();
    }, false);
    document.addEventListener("keydown", function (e) {
        if (event.keyCode === 123) {
            disabledEvent(e);
        }
    }, false);
    function disabledEvent(e) {
        if (e.stopPropagation) {
            e.stopPropagation();
        } else if (window.event) {
            window.event.cancelBubble = true;
        }
        e.preventDefault();
        return false;
    }
};