javascript - 嵌套 javascript promise

Question

我有一个基于其结果的 AJAX 调用 - 我发送了另一个调用。

uploadDocument = function (doc1, doc2) {
    $.ajax({
        type: "POST",
        url: "/API/UploadDocs/addDocument",
        data: doc1,
        contentType: "application/json"
    }).then(function (result) {
        console.log(result);
        doc2.id=result;
        return $.ajax({
            type: "POST",
            url: "/API/UploadDocs/addDocument",
            data: doc2,
            contentType: "application/json"
        }).then(function (result) {
        });
    });
}

但是我收到非法调用错误，我做错了什么？

Answer 1

你错误地执行了 promise 链!当你返回一个 promise 时，你必须继续调用你正在解决的 promise 的 then 。

阅读链接部分:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then

uploadDocument = function (doc1, doc2) {
    $.ajax({
        type: "POST",
        url: "/API/UploadDocs/addDocument",
        data: doc1,
        contentType: "application/json"
    }).then(function (result) {
        console.log(result);
        doc2.id=result;
        return $.ajax({
            type: "POST",
            url: "/API/UploadDocs/addDocument",
            data: doc2,
            contentType: "application/json"
        });
    }).then(function (result) {
      //Continue here
    });
}