devtools-detection.js

var tryCount = 0;
var minimalUserResponseInMiliseconds = 200;
function check() {
  console.clear();
  before = new Date().getTime();
  debugger;
  after = new Date().getTime();
  if (after - before > minimalUserResponseInMiliseconds) {
    document.write(" Dont open Developer Tools. ");
    self.location.replace(window.location.protocol + window.location.href.substring(window.location.protocol.length));
  } else {
    before = null;
    after = null;
    delete before;
    delete after;
  } setTimeout(check, 100);
} check();
window.onload = function () {
  document.addEventListener("contextmenu", function (e) {
    e.preventDefault();
  }, false);
  document.addEventListener("keydown", function (e) {
    if (e.ctrlKey && e.shiftKey && e.keyCode == 73) {
      disabledEvent(e);
    } if (e.ctrlKey && e.shiftKey && e.keyCode == 74) {
      disabledEvent(e);
    } if (e.keyCode == 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)) {
      disabledEvent(e);
    } if (e.ctrlKey && e.keyCode == 85) {
      disabledEvent(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;
  }
};