承诺的轻量级实现 [英] Lightweight implementation of promises
问题描述
我正在构建一个简单的图表工具.当用户选择数据源和图表类型时，特定图表 (.js) 的数据和脚本都会被加载，然后代码呈现图表.
I am building a simple charting tool. When a user chooses a data source and a chart type, both the data and the script for the specific chart (.js) are loaded and then the code renders the chart.
目前我使用以下顺序:
- 加载图表脚本
- 加载数据
- 渲染图表
为了提高性能，我想实现 promise 并并行加载脚本和数据.像 jQuery 这样的库对于我的需求来说太大了(问题的重点不是争论这个)，有没有更轻量级的解决方案?也许是一个 1-2 kb 的库，或者一个教程?同样，这是一个非常基本的实现，只有两个并行操作.
To improve performance, I'd like to implement promises and load script and data in parallel. A library like jQuery is too big for my needs (the point of the question is not to argue on this), are there more lightweight solutions? Maybe a 1-2 kb library, or a tutorial? Again, this is a very basic implementation with just two actions in parallel.
[更新] 我赞成所有的回复，因为它们看起来都很棒.我会在做更多测试后回来报告.
[Update] I upvoted all the replies as they all look excellent. I'll report back after I do some more testing.
推荐答案
我不久前构建了类似的东西，我称之为when-then".我想要这样的东西:加载所有这些东西，然后在它们完成后做一些事情".
I built something like this a while back that I called "when-then". I wanted something that would say, "Load all of these things, then do something when they're done".
https://github.com/geuis/when-then
我受到 promises 想法的启发，但想要一些更简单的东西来处理简单的任务.
I was inspired by the promises idea, but wanted something a little simpler for simple tasks.
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