在 Web 前端开发中，“一次性并发请求多个资源”是最常见的实战场景之一。本文基于 Modern JavaScript Tutorial（en.javascript.info）中 Fetch 章节 的经典任务 getUsers ，完整讲解如何用 fetch + Promise.all 批量、并发地从 GitHub API 拉取多个用户的公开信息，并正确处理网络失败与不存在的用户。读完本文，你将 ...
返回值自动包装为Promise：即使函数内部返回的是一个普通值，这个值也会被自动包装成一个已解决的Promise。 async function foo () { return 42; // 等价于 return Promise.resolve (42) } 函数内部可以使用await关键字：await只能在async函数内部使用，它用于暂停函数的执行，等待一个Promise的解决。
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Mount an external object store such as Amazon S3 into a sandbox and work with remote files as if they were local. Code in the sandbox reads and writes objects through a normal filesystem path instead ...
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fetch() // Browser function for calling an API async / await // Used to wait for API responses try / catch // Used to handle errors GET // Read data POST // Add data PUT // Update data DELETE // ...
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