if node.isEditable()
local txt,s=node.text,""
local gb=node.getTextSelectionEnd()
if txt and gb~=utf8.len(txt) and txt~="" then
s=utf8.sub(txt,1,gb)
service.setText(node,s)
    service.speak("光标后已删")
   else
service.beep()
 end
else
service.execute("图片描述",node)
end
return true