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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>如果您添加一个数字和一个数字字符串，结果将是一个连接的字符串：</p> <p id="demo"></p> <script> var x = 10; var y = "20"; var z = x + y; document.getElementById("demo").innerHTML = z; </script> </body> </html>