错误:无法读取属性提取.使用 jest-expo 和 react native

Obviously this is a guess without a code snippet, but looking at what fetch.js looked like at the time, the undefined value whose fetch property we can't read is the variable self (see line 1), which was meant to be set to the this context (see line 466).

因此，似乎 fetch.js 期望在 this 引用 window 的环境中运行，但 jest-expo，作为一个测试工具，正在其他一些环境中运行它，可能是在 this 是 undefined 的严格模式下.

Therefore, it seems that fetch.js is expecting to run in an environment where this refers to the window, but jest-expo, being a testing tool, is running it in some other environment, probably in strict mode where this is undefined.

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