javascript - 异步箭头功能的语法(Syntax for async arrow function)

Question

I can mark a javascript function as "async" (ie returning a promise) with the async keyword.

(我可以使用async关键字将javascript函数标记为“异步”（即返回承诺）。)

Like this:

(像这样：)

async function foo() {
  // do something
}

What is the equivalent syntax for arrow functions?

(箭头功能的等效语法是什么？)

  ask by BonsaiOak translate from so

Answer 1

Async arrow functions look like this:

(异步箭头函数如下所示：)

const foo = async () => {
  // do something
}

Async arrow functions look like this for a single argument passed to it:

(传递给它的单个参数的异步箭头函数如下所示：)

const foo = async evt => {
  // do something with evt
}

The anonymous form works as well:

(匿名形式也可以使用：)

const foo = async function() {
  // do something
}

An async function declaration looks like this:

(异步函数声明如下所示：)

async function foo() {
  // do something
}

Using async function in a callback :

(在回调中使用异步函数：)

const foo = event.onCall(async () => {
  // do something
})