javascript - Why are JS scripts usually place in the header of a document? -

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Why do JS scripts usually put in the header of a document? Is it necessary for standards or is there any special reason?

This is just a conference. It is usually recommended to insert the script at the end of the body so that the pages can display them before loading, which is always a plus. In addition, document.body should not be used until then. Until the document is loaded or if you put the script in the body.


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