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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>整数（没有句点或指数符号的数字）最多精确到 15 位：</p> <p id="demo"></p> <script> var x = 999999999999999; var y = 9999999999999999; document.getElementById("demo").innerHTML = x + "<br>" + y; </script> </body> </html>