I am studying asynchronous processing in JavaScript. For the past few days, I've been wandering around async, await, and Promise. Yesterday, my brain was pretty much overflowing with processing logic.

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本内容遵循CC 4.0 BY-SA版权协议 异步迭代这件事，说穿了就是一句话： 数据不是一次性到齐的，而是一个一个、一批一批地流过来，你的代码要能一边等、一边收、一边处理 。不管是 Python 里的 ...

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。