更新数组值并将其用于异步函数范围

Question

如何从异步函数为数组赋值并在所述函数范围之外使用它？

基本上我有一个工厂随机化数组中的值，所以我可以随机附加图像到div。

$scope.Resources = ResourceFetch.getResource().then(function(resources){
    $scope.img1 = JSON.stringify(resources.img1);
    $scope.img2 = JSON.stringify(resources.img2);
    $scope.img3 = JSON.stringify(resources.img3);
    $scope.img4 = JSON.stringify(resources.img4);

    var myArray = [$scope.img1, $scope.img2, $scope.img3, $scope.img4];
    console.log('myArray is ' + myArray); // <- Fine.

    var shuffledArray = [];

    ShuffleArray.getShuffled(myArray).then(function(array){
        shuffledArray = array;
        console.log('Shuffled array is ' + array); // <- Fine.
        console.log('Shuffled array again ' + shuffledArray); // <- Fine
        });

   console.log('Shuffled array outside is  ' + shuffledArray); // <- Nothing.
});

Answer 1

你的代码看起来很好，但不要忘记getShuffled可能是异步的并且仅在完成之后完成

console.log('Shuffled array outside is  ' + shuffledArray); // <- Nothing.

被召唤。