这应该可以让你开始生成一个右键点击事件。右键点击的关键是button参数：按钮= 2。

if (document.createEvent) {
  var rightClick = document.createEvent('MouseEvents');
  rightClick.initMouseEvent(
    'click', // type
    true,    // canBubble
    true,    // cancelable
    window,  // view - set to the window object
    1,       // detail - # of mouse clicks
    10,       // screenX - the page X coordinate
    10,       // screenY - the page Y coordinate
    10,       // clientX - the window X coordinate
    10,       // clientY - the window Y coordinate
    false,   // ctrlKey
    false,   // altKey
    false,   // shiftKey
    false,   // metaKey
    2,       // button - 1 = left, 2 = right
    null     // relatedTarget
  );
  document.dispatchEvent(rightClick);
} else if (document.createEventObject) { // for IE
  var rightClick = document.createEventObject();
  rightClick.type = 'click';
  rightClick.cancelBubble = true;
  rightClick.detail = 1;
  rightClick.screenX = 10;
  rightClick.screenY = 10;
  rightClick.clientX = 10;
  rightClick.clientY = 10;
  rightClick.ctrlKey = false;
  rightClick.altKey = false;
  rightClick.shiftKey = false;
  rightClick.metaKey = false;
  rightClick.button = 2;
  document.fireEvent('onclick', rightClick);
}

我建议在谷歌上搜索“document.createEvent”和“document.createEventObject”，以获得Mozilla和MSDN网站上关于API的更多细节。
希望这有帮助！