if node.isEditable()
local txt,s=node.text,""
local gb=node.getTextSelectionEnd()
if gb>0 then
s=utf8.sub(txt,gb+1,-1)
service.setText(node,s)
service.setSelection(node,0)
    service.speak("光标前已删")
   else
service.beep()
 end
return true
end