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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>可以用科学（指数）记数法写出超大或超小的数字：</p> <p id="demo"></p> <script> var y = 123e5; var z = 123e-5; document.getElementById("demo").innerHTML = y + "<br>" + z; </script> </body> </html>