我正在尝试编写一个循环来执行多个 http 请求并将每个响应添加到列表中。
但是，我认为我的做法并不正确。
我认为我没有正确地履行要求的 promise 。 for 循环后的控制台日志显示 myList 数组为空。
代码:
var _myList = []
function getStuff() {
var deferred = $q.defer()
var url = someUrl
$http.get(url).success(function(response) {
if ( response.array.length > 0 ) {
// loop starts here
for ( var i=0; i < response.array.length; i++ ) {
getThing(response.array[i].id);
};
// check the varibale here
console.log(_myList);
deferred.resolve('Finished');
} else {
deferred.resolve('No stuff exists');
};
}).error(function(error) {
deferred.reject(error);
});
return deferred.promise;
};
function getThing(thindId) {
var deferred = $q.defer()
var url = someUrl + thingId;
$http.get(url).success(function(response) {
_myList.push(response);
deferred.resolve(response);
}).error(function(error) {
deferred.reject(error);
});
return deferred.promise;
};
最佳答案
您可以按如下方式简化代码:
var allThings = response.array.map(function(id){
var singleThingPromise = getThing(id);
//return a single request promise
return singleThingPromise.then(function(){
//a getThing just ended inspect list
console.log(_myList);
})
});
$q.all(allThings).then(function(){
//only resolve when all things where resolved
deferred.resolve('Finished');
}, function(e){
deferred.reject('Something went wrong ' + e);
});
关于javascript - Angular - For 循环 HTTP 回调/ promise ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34662067/