Question

我有一个数组来上传数据，我希望它们逐个发送到服务器。我希望在发送下一个之前完成前一个。实际上，在每次回复之后，我想决定是否发送下一个。

while (packetCount < bulkUploadPackets.length) {
  d = d.then(save(bulkUploadPackets[packetCount]))
    .then(function(uploadResponse) {
      //I want to come here after first call complete 
      //before second call is fired and so on
      packetCount++;
    });
}


save: function(modelToSave) {
  var defer = $.Deferred();
  var self = this;
  this.model = modelToSave;
  Backbone.sync('create', this, {
    success: function(data, textStatus, jqXHR) {
      console.log("success" + data);
      defer.resolve(data);
    },
    error: function(response) {
      defer.reject(errorObj);
    }
  });

  return defer.promise();
}

Answer 1

你可以使用递归函数并在其中放入递归调用：

(function loop() {
     if (packetCount<bulkUploadPackets.length) {
           d = d.then(save(bulkUploadPackets[packetCount]))
                .then(function(uploadResponse){
                      //I want to come here after first call complete before second call is fired and so on
                      packetCount++;
                      loop();
                 }); 
     }
})();

AJAX在数组循环中调用，仅在上一次完成后调用next

1 个答案: