jquery - Invoke download of a tag in html using javascript? -

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currently have <a> tag has declared download attribute, this: 

<a href="123.png" download >download it!</a>

which tag above, can download image url when clicking on link. have button on page, : 

<button>download using button!</button>

is there way let user download not clicking on link clicking on button instead.

my purpose making auto code can download image specified class on html page.

using native javascript this:

html:

<a id="download-link" href="123.png" download >download it!</a>

javascript:

document.getelementbyid("download-link").click();

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