使用成功/错误/终于/捕获与AngularJS承诺 [英] Using success/error/finally/catch with Promises in AngularJS

问题描述

我用 $ HTTP 在AngularJs，我不知道如何使用返回的承诺，来处理错误。我有这个code：

I'm using $http in AngularJs, and I'm not sure on how to use the returned promise and to handle errors. I have this code:

$http.get(url)
.success(function (data) {
    // Handle data
})
.error(function (data, status) {
    // Handle HTTP error
})
.finally(function () {
    // Execute logic independent of success/error
})
.catch(function (error) {
    // Catch and handle exceptions from success/error/finally functions
});

这是一个很好的办法做到这一点，或者是有一个更简单的方法？

Is this a good way to do it, or is there an easier way?

推荐答案

承诺超过陈述，让我们的前preSS自己同步异步code的抽象。他们重新present的一次性任务的执行。

Promises are an abstraction over statements that allow us to express ourselves synchronously with asynchronous code. They represent a execution of a one time task.

他们还提供了异常处理，就像正常的code，你可以从一个承诺退货或你可以扔掉。

They also provide exception handling, just like normal code, you can return from a promise or you can throw.

你会在同步code要的是：

What you'd want in synchronous code is:

try{
  try{
      var res = $http.getSync("url");
      res = someProcessingOf(res);
  } catch (e) {
      console.log("Got an error!",e);
      throw e; // rethrow to not marked as handled
  }
  // do more stuff with res
} catch (e){
     // handle errors in processing or in error.
}

该promisified版本很相似的：

The promisified version is very similar:

$http.get("url").
then(someProcessingOf).
catch(function(e){
   console.log("got an error in initial processing",e);
   throw e; // rethrow to not marked as handled, 
            // in $q it's better to `return $q.reject(e)` here
}).then(function(res){
    // do more stuff
}).catch(function(e){
    // handle errors in processing or in error.
});

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