可以获取天气信息，不过天气是文字形式的！
 

------------------------regex-------------------------
function get_weather(con)
	local s = "<current_conditions>.*<\/forecast_conditions>"
	local i ,j = string.sub(con, string.find(con,s)) 
	local s = "\"[a-z0-9A-Z%s:%%]*\""  
	local info
	for word in string.gmatch(i, s) do 
			info = tostring(info).."\t"..tostring(word)  
	end
	local i, j = string.gsub(info, "\"","")
	local l = split(i,"\t")
	return l
end

------------------------split-------------------------
function split(string, spt)
	local find_index = 1
	local spt_index = 1
	local spt_arr = {}
	while true do
		local find_end = string.find(string, spt, find_index)
		if not find_end then
			spt_arr[spt_index] = string.sub(string, find_index, string.len(string))
			break
		end
		spt_arr[spt_index] = string.sub(string, find_index, find_end - 1)
		find_index = find_end + string.len(spt)
		spt_index = spt_index + 1
	end
	return spt_arr
end

weather = widget({type = "textbox" })
vicious.register(weather, vicious.widgets.weather, 
 function (widget, args)
	local http = require("socket.http")
	local url = "http://www.google.com/ig/api?weather=chengdu"
	local con, ret = http.request(url)
	if con == nil then
		return nil
	else
		local l = 	get_weather(con)
		return '<span color="brown">WEATHER:</span><span  color="orange">'..l[2]..' '..l[4]..'°C</span>' 
	end
 end
, 3600,"ZUUU")

 mywibox_top[s].widgets = {
        {
            mylauncher,
            mytaglist[s],
            mypromptbox[s],
            layout = awful.widget.layout.horizontal.leftright
        },
        mylayoutbox[s],
        mytextclock,
        s == 1 and mysystray or nil,
				spacer,
				uptime,
		  	        weather,
				spacer,
				weathericon,
        mytasklist[s],
        layout = awful.widget.layout.horizontal.rightleft
    }