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我想在使用queue.js时以适当的方式处理错误，但是对于如何制作它有一些不确定性。

例如我们有这样的代码： 

function getImage(path, callback) {
  var img = new Image();
  img.src = path;
  //I have some issues about error object here.
  //What should we place in callback(???) to get internal error object with type and message?
  //Is it good practise to write: If (img.complete)?
  if (img.complete) callback(null, img);
  else callback(alert("Image loading fail")); //<- If we store here just text, it won't be available in function ready()
}

queue()
.defer(getImage, "image1.png")
.defer(getImage, "image2.png")
.await(ready);

function ready(error, img1, img2) {
  //How to handle errors properly on this stage?
  if (error !== null) {
    alert("Something wrong!"); // <- This doesn't work when path to image is wrong
  } else {
    //Do some cool stuff
  }
  console.log(error); // <- always show null whatever I store in callback for error case in function getImage()
}

问题是关于在使用 queue.js 时处理错误的一般情况，而不仅仅是在本示例的范围内。因此，欢迎您的所有经验和实践。

编辑：答案在那里可读https://stackoverflow.com/a/18086989/1974961

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