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之前一直很迷惑这块，今天看到以下代码，我多少往前迈进一步。
An async function always returns a promise.
async function fn() {return 'hello';}
fn().then(console.log)
// hello
The function fn returns ‘hello’. Because we have used async, the return value ‘hello’ is wrapped in a promise (via Promise constructor).
Here’s an alternate representation without using async —
function fn() {return Promise.resolve('hello');
}
fn().then(console.log);
// hello
In this, we are manually returning a promise instead of using async.
正文完