编辑代码:
查看结果 »
试一试 - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>A function can access variables defined outside the function:</p> <button type="button" onclick="myFunction()">Click Me!</button> <p id="demo"></p> <script> var a = 4; function myFunction() { document.getElementById("demo").innerHTML = a * a; } </script> </body> </html>