window.onload vs. body.onload vs. document.onready [duplicate]

This question already has answers here: 开发者_开发问答 window.onload vs $(document).ready() (17 answers) Closed 7 years ago.

What is the difference between window.onload, document.onready and body.onload ?

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window.onload will wait until all assets have finished downloading, such as images and scripts.

DOM ready waits until you can access the DOM via the API.

As a side note, in this day and age, you ought to be using window.addEventListener('load', function() { }, false) or attachEvent() for older IEs.