我该如何“上载"广告?等待“提取"完全的?

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问题描述

长话短说，我会显示代码.

Long story short, I'll show the code.

some.html

<html><script src="some.js"></script></html>

some.js

window.onload = () => console.log( "onload" );
(async (url, cb) => cb( await ( await fetch(url) ).json() ))
( "some.json", () => console.log( "in async" ) );

和some.html输出:

and some.html outputs:

onload
in async

我已经做了一些工作，例如图像以真实抓取方式加载，因此 fetch().then()对我不起作用.

I've done some works e.g. image loading in real fetch, so fetch().then() doesn't work for me.

现在我的问题就是标题所说的，如何让加载"等待获取"完成?

Now my question is as title says, how can I let "onload" waiting for "fetch" complete?

推荐答案

我认为您要实现的是在window.onload之前开始获取操作，但是onload需要先等待获取操作，然后再执行其他操作...

What I think you are trying to achieve is the fetch starts before window.onload, but onload needs to wait for the fetch before doing anything else ...

const promiseOfSomeData = fetch("some.json").then(r=>r.json()).then(data => {
    console.log('in async');
    return data;
});
window.onload = async () => {
    let someData = await promiseOfSomeJsonData;
    console.log("onload");
};

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