我正在全天搜索論壇,但無法解決我的問題。我使用NodeJS和async.waterfall來提出一些API請求。 同樣的結構適用於我,但不適用於此;Node.js「回調已被調用」。但沒有任何其他回調
async.waterfall([
function (callback) {
callback(null, latitude, longitude, callback);
},
getGeoNames,
],
function (err, result) {
console.log("ok");
})
,這裏是功能getGeoNames錯誤
function getGeoNames(latitude, longitude, callback) {
var countryKey = 'country';
var stateKey = 'administrative_area_level_1';
var url = "http://maps.googleapis.com/maps/api/geocode/json?latlng="+latitude+","+longitude;
request({
url: url,
json: true
}, function (error, response, body) {
var adresses = body.results[0].address_components;
var geo = {};
for (var i = 0, len = adresses.length; i < len; i++) {
var adress = adresses[i];
//console.log(adress);
if (adress.types[0] == countryKey) {
geo.country = adress.long_name;
if (geo.state !== undefined) break;
}
else if (adress.types[0] == stateKey) {
geo.state = adress.long_name;
if (geo.country !== undefined) break;
}
};
return callback(null, geo); // ERROR HERE <-----------------
})
}
可以要求功能運行的回調()函數,所以有人拼命地跑前? 我試過沒有「返回」,但它是一樣的。
if (fn === null) throw new Error("Callback was already called."); ^
Error: Callback was already called. at c:\Users\Serega\node_modules\async\dist\async.js:803:36 at Request._callback (c:\Users\Serega\WebstormProjects\untitled1\server.js:174:20) at Request.self.callback (c:\Users\Serega\node_modules\request\request.js:200:22) at emitTwo (events.js:87:13) at Request.emit (events.js:172:7) at Request. (c:\Users\Serega\node_modules\request\request.js:1067:10) at emitOne (events.js:82:20) at Request.emit (events.js:169:7) at IncomingMessage. (c:\Users\Serega\node_modules\request\request.js:988:12) at emitNone (events.js:72:20)
Process finished with exit code 1
PS:其他瀑布函數與我的請求一起工作。
感謝您的幫助!
Спасибоогромное - помогло:) –