Document.ready() function is completely different from body onload() function .
First of all Document.ready() function is called as soon as DOM is loaded but body.onload() function is called when everything gets loaded on the page that includes DOM, images and all associated resources of the page.
We can have as many document.ready() functions in a page but onload function is limited on one time.
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Document.ready() function is completely different from body onload() function .