javascript - Why doesn't a console loaded script have access to the DOM? -

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i added script dom using

// in console of facebook.com  var test = document.createelement('script'); test.src = "foo"; document.head.appendchild(test);

but script has no access dom.

does have same origin policy?

here working solution add jquery:

var jq = document.createelement('script'); jq.src = "//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"; document.getelementsbytagname('head')[0].appendchild(jq); jquery.noconflict();

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