fix keydown event not bubble
fix keydown event not bubble

JavascriptTips/element,immissile/m-element,Leopoldthecoder/element-1,JavascriptTips/element,huguangju/element,ElemeFE/element,huguangju/element,Kingwl/element,Raganof/element,immissile/m-element,ElemeFE/element,Leopoldthecoder/element-1,Kingwl/element,baiyaaaaa/element,baiyaaaaa/element,Raganof/element