如何在JavaScript中捕获NetworkError？ [英] How to catch NetworkError in JavaScript?

问题描述

在Chrome的JavaScript控制台中，如果我运行它：

In Chrome's JavaScript console, if I run this:

var that = new XMLHttpRequest();
that.open('GET', 'http://this_is_a_bad_url.com', false);
that.send();

我收到故意预期的错误：

I get an intentionally expected error:

NetworkError: A network error occurred.

我想抓住这个，所以我使用：

I want to catch this, so I use:

var that = new XMLHttpRequest();
that.open('GET', 'http://this_is_a_bad_url.com', false);
try {
  that.send();
} catch(exception) {
  if(exception instanceof NetworkError) {
    console.log('There was a network error.');
  }
}

但是，我收到一条关于未定义NetworkError的错误：

However, I get an error about NetworkError not being defined:

ReferenceError: NetworkError is not defined

我怎样才能捕获NetworkError？

How can I catch NetworkError?

推荐答案

我认为你的意思是：

if(exception.name == 'NetworkError'){
   console.log('There was a network error.');
}

我不相信错误是 NetworkError ，但是以这种方式抛出：

I don't believe the Error is an instance of NetworkError, but thrown in this manner:

throw {
   name: 'NetworkError',
   message: 'A network error occurred.'
   // etc...
}

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