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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。
异步编程,尤其是 Promise 和 Async/Await,是 JavaScript 开发者绕不开的核心话题。不管你是刚入门前端的新手,还是天天和后端接口打交道的“老油条”,只要写 JS,几乎都会碰到“数据还没回来,代码已经往下跑了”的尴尬局面。这篇文章我想从一个常年写异步代码的人的角度,把 Promise 和 Async/Await ...