W3School TIY Editor
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<!DOCTYPE html> <html> <body> <input type="file" id="myFile" autofocus> <p>单击“尝试”按钮可查看文件上传按钮是否在页面加载时自动获得焦点。</p> <p id="demo"></p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myFile").autofocus; document.getElementById("demo").innerHTML = x; } </script> </body> </html>