[Javascript] 페이지가 새 탭 또는 새 창으로 열렸는지 확인

Code Snippet

if (window.history.length === 1) {
	// Do something...
}

References

https://www.sitepoint.com/community/t/find-out-when-page-is-opened-in-new-window-or-new-tab/8910/11