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<!DOCTYPE html> <html> <body> <h2>JavaScript 运算符</h2> <p>x = 5，y = 2，计算z = x + y，并显示z：</p> <p id="demo"></p> <script> var x = 5; var y = 2; var z = x + y; document.getElementById("demo").innerHTML = z; </script> </body> </html>