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<!DOCTYPE html> <html> <body> <p>x = 10 和 y = 5，计算 x = y，并显示 x：</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = 10; var y = 5; x = y; document.getElementById("demo").innerHTML = x; } </script> </body> </html>