javascript – 如何使用以任意顺序返回的promise来存储for循环的计数？

我正在制作一系列http请求,我需要在返回时将结果存档到列表对象中.我正在使用有角度的承诺.

因为promise只在for循环结束后解析,所以它们都被归入列表的最后一个索引.

for (var i = 0;i < list.length; i+=1) {
    Promise.do(action).then(function(result) {
        list[i] //i is always at last index because the for loop has already completed
    }
}

解决方法:

我会尝试使用$q.all：

var promises = [];

for (var i = 0; i < list.length; i += 1) {
    promises.push(Promise.do(action));
}

$q.all(promises).then(function(results) {
    console.log(results);
});

从文档：

Returns a single promise that will be resolved with an array/hash of
values, each value corresponding to the promise at the same index/key
in the promises array/hash. If any of the promises is resolved with a
rejection, this resulting promise will be rejected with the same
rejection value.

标签：angular-promise,javascript,angularjs,promise
来源： https://codeday.me/bug/20190830/1769045.html