JavaScript 兼容所有浏览器的通用点击事件触发方法

/**
 * 触发单击事件
 * @param elem 需要触发事件的DOM对象
 */
function fireClickEvent(elem)
{
  var event;
  if(window.MouseEvent) event = new MouseEvent('click');
  else
  {
    event = document.createEvent('MouseEvents');
    event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  }
  elem.dispatchEvent(event);
}