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<!DOCTYPE html> <html> <body> <h2>JavaScript 变量</h2> <p>在此示例中，x、y 和 z 是变量。</p> <p id="demo"></p> <script> var x = 5; var y = 6; var z = x + y; document.getElementById("demo").innerHTML = "z 的值为：" + z; </script> </body> </html>