模拟按键javascript NO JQuery

// 模拟按键事件
function simulateKeyPress(keyCode) {
  var eventObj = document.createEventObject
    ? document.createEventObject()
    : document.createEvent("Events");

  if (eventObj.initEvent) {
    eventObj.initEvent("keydown", true, true);
  }

  eventObj.keyCode = keyCode;
  eventObj.which = keyCode;

  if (document.dispatchEvent) {
    document.dispatchEvent(eventObj);
  } else if (document.fireEvent) {
    document.fireEvent("onkeydown", eventObj);
  }
}

// 调用示例
simulateKeyPress(13); // 模拟按下回车键