javascript - Why is the content in Img.onload = funcion(){} the last thing after the image is preloaded? ?

Question

RT
Attached is the picture executed in the browser

Answer 1

onload event handler called when the image is loaded.
onload=function means that after the image is loaded, call this onload time, which is the method you wrote yourself. This method is called event callback, or delegation. balabala...anything is fine

Answer 2

onload is actually an asynchronous process