The difference is that onDocumentReady is called after the DOM is loaded without waiting for all the contents to get loaded. While window.onload() function waits until the contents of page is loaded.Suppose there is very large image on a page, at that time onDocumentReady will wait until that image is loaded totally.So while using the window.onlaod() function the execution will be slow, but the onDocumentReady will not wait until the image is loaded.
Javascript
Topic: JS Window
What is difference between window.onload and onDocumentReady?
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