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笔者也早就觉得哪里不对劲，终于有人把实话说了出来：async/await 可能会带来麻烦。本篇精读正是围绕这一观点展开，并结合本仓库中 《AsyncAwait 优越之处》 、 《Javascript 事件循环与异步》 等姊妹篇，从语法糖本质、并发语义、事件循环三个层面把它讲透。

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。