来自一个或多个数组的值的总和

Question

如何总结多个Ajax调用，

我在for循环中编写了ajax方法，因为我需要得到多个结果，

  for (i = 0; i < invoice_ids.length; i++) {
      $.ajax({
            url: "payments/getInvoiceAmount",
            method: "post",
            dataType: 'json',
            data: {"amount_tds": amount_tds, "invoice_id":invoice_ids[i]},
            success: function(response) {
               //need get the sum of response

            }
        });
    }

上面的ajax方法给出了多个结果，结果就像

 [{"invoice_amount":"1000"}]
 [{"invoice_amount":"1000"}]
 [{"invoice_amount":"1000"}]
 [{"invoice_amount":"1000"}]
 [{"invoice_amount":"1000"}]

如何获得 invoice_amount：5000

等输出

Answer 1

您可以尝试以下

// Create an array of promises
var promises = [];
for (i = 0; i < invoice_ids.length; i++) {
     promises.push(performAction(amount_tds, invoice_ids[i]));
}

// Iterate over the responses and calcuate the sum 
Promise.all(promises).then((responses) => {
    var sum = responses.reduce((a,c) => a + c.reduce((acc, b) => acc + parseFloat(b.invoice_amount), 0), 0);
});

// Create a function that sends ajax
function performAction(amount_tds, invoice_id) {
      return $.ajax({
            url: "payments/getInvoiceAmount",
            method: "post",
            dataType: 'json',
            data: {"amount_tds": amount_tds, "invoice_id":invoice_ids}
        });
}