js 檢測瀏覽器開發者控制台是否被打開

var element = new Image();
Object.defineProperty(element, "id", {
  get: function () {
    debugger;
  },
});

requestAnimationFrame(function check() {
  console.dir(element);
  requestAnimationFrame(check);
});

See also:

• https://stackoverflow.com/questions/7798748/find-out-whether-chrome-console-is-open