javascript - 为什么 fetch 会返回 "TypeError: Failed to fetch"而不仅仅是 "Failed to fetch"？

Question

我正在运行此代码并在没有互联网连接的情况下进行测试:

fetch(url, options)
  .then(res => {
    // irrelevant, as catch happens immediately on no network connection
  })
  .catch(err => {
    console.log('Failed fetch ', err);
  });

“类型错误”是什么意思？

Answer 1

从你的代码片段中，它应该记录

Failed fetch TypeError: ...

获取失败时抛出

和TypeError

更多信息请查看

1. https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#Checking_that_the_fetch_was_successful
2. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypeError