local txt=service.getText(node)
local ks=service.getSelectionStart()--获取选中开始位置
local js=service.getSelectionEnd()--获取选中结束位置
if RFirst then
RFirst = 1;
else
RFirst = 2;
end
if RFirst == 2 then
RCount = 1;
end
if RFirst == 1 then
RCount = RCount+1;
end
if RCount > 2 then
RCount = 1
end
switch RCount 
case 1
service.setSelectionMode(true)
service.asyncSpeak("选择模式")
case 2
txt=utf8.sub(txt,1,ks)..utf8.sub(txt,js+1,-1)
s=utf8.sub(txt,ks,js)
service.setText(node,txt)
service.setSelectionMode(false)--设置选择模式
service.asyncSpeak(s.."已删除")
end
return true