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<!DOCTYPE html> <html> <body> <p>y = 5，计算x = y * 2，并显示x：</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var y = 5; var x = y * 2; document.getElementById("demo").innerHTML = x; } </script> </body> </html>