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並前往https://books.google.com.tw/books?id=3GOuDwAAQBAJ&pg=PA550&lpg=PA550&dq=document+hasfocus&source=bl&ots=_TLavz-TUA&sig=ACfU3U33XHjJ_8wb_37KE1g5f4o2WuKGFw&hl=zh-TW&sa=X&ved=2ahUKEwjLq_rf7vT2AhVAnGoFHbqYBNkQ6AF6BQjPAhAD

Professional JavaScript for Web Developers

The second addition is document.hasFocus() , which returns a Boolean value indicating if the document has focus: let button = document.

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