Home
JS
JS
Tryit: JAVASCRIPT
运行 ❯
×
Change Orientation
Change Theme, Dark/Light
<!DOCTYPE html> <html> <body> <iframe src="https://www.cnn.com"></iframe> <iframe src="https://www.bbc.com"></iframe> <iframe src="https://www.nytimes.com"></iframe> <p>单击该按钮可获取在此页面上找到的帧数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = window.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>