编辑代码:
查看结果 »
试一试 - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>Click anywhere in the document (the right frame) to get focus. If you click outside the document, it will lose focus.</p> <p id="demo"></p> <script> setInterval("myFunction()", 1); function myFunction() { var x = document.getElementById("demo"); if (document.hasFocus()) { x.innerHTML = "The document has focus."; } else { x.innerHTML = "The document DOES NOT have focus."; } } </script> </body> </html>