<img src="https://im0-tub-ru.yandex.net/i?id=219f993e6aca8b7dbedf26f3bb4bac61&n=13&exp=1" alt="">

$(function() {
  $imgs= $('img');
  $imgs.prop({
    draggable: false,
  });
  $imgs.on({
    dragstart: noselect,
    selectstart: noselect,
    contextmenu: noselect,
  })

  function noselect(e) {
    e.preventDefault();
    return false;
  }
})