async / await
最后更新于：2022-04-02 03:27:40
[TOC]
## async/await 同步
```
async getBooksAndAuthor(authorId){
const bookPromise = bookModel.fetchAll();
const authorPromise = authorModel.fetch(authorId);
const book = await bookPromise;
const author = await authorPromise;
return {
author,
books:book.filter(book=>book.authorId === authorId),
}
}
```
## async/await 异步 执行 fetch 函数
```
async function mount() {
const result = await Promise.all(
fetch('a.json'),
fetch('b.json'),
fetch('c.json')
);
render(...result);
}
```
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