如何在JavaScript中用Promise替换'Async = false'? [英] How to replace 'Async=false' with promise in javascript?

问题描述

我已经阅读了很多有关 promises 的信息，但是我仍然不确定如何实现它.

I have read a lot about promises but I'm still not sure how to implement it.

我使用 async = false 编写了以下AJAX调用，以使其正常工作，但是我想用promise代替它，因为我看到 async = false 是不推荐使用.

I wrote the folowing AJAX call with async=false in order for it to work, but I want to replace it with promise as I saw that async=false is deprecated.

self.getBalance = function (order) {
    var balance;
    $.ajax({
        url: "/API/balance/" + order,
        type: "GET",
        async: false,
        success: function (data) {
            balance = data;
        },
        done: function (date) {
        }
    });
    return balance;
}

您能帮我吗?我只需要一个例子来理解它.

Would you be able to help me? I just need an example to understand it.

推荐答案

从 getBalance 方法返回promise对象:

Return promise object from getBalance method:

self.getBalance = function (orderNumber) {
    return $.ajax({
        url: "/Exchange.API/accountInfo/balance/" + orderNumber,
        type: "GET"
    });
}

并在以后像这样使用它:

and use it later like this:

service.getBalance().then(function(balance) {
    // use balance here
});

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