javascript - Using chrome.storage.get to get a variable -

i'm making little chrome extension , have used options page use chrome.storage.sync.set set variable pws. however, on pop-up page cannot retrieve variable , use in string. here code goes:

weather.open("get", "http://api.wunderground.com/api/"+wu_api_key+"/conditions/q/ca/pws:"+pws+".json", true); weather.send()  }) 

how pws in there variable chrome.sync.storage.get?

i tried

chrome.storage.sync.get(pws, function(result){  var pws = result.pws console.debug('result:',pws);  }); 

but no avail.

if use "pws" key store pws, could:

chrome.storage.sync.get("pws", function(result) {     var pws = result.pws;     console.log("result:", pws); });