When the mount method of vue takes no parameters?

new Vue ({.}). Mount (); does not add parameters here, but generally needs to add a dom selector. What is the operating mechanism when it is not added? can you analyze it from the source code level? Please give me more advice

Mar.20,2021

if $mount does not provide parameters, the template will be rendered as an element outside the document, and you must insert it into the document using native DOM API (original link: https://blog.csdn.net/c231115.)

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