onload , then you probably should go look at how a framework like jQuery implements its $(document).ready() method. It's fairly involved depending upon the ... ... <看更多>

This tutoial shows you how to check if the document is ready using vanilla JavaScript. ... <看更多>

If I understand your question correctly, you are asking how to stack asynchronous calls so that the second function only executes when the first is complete ... ... <看更多>