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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>数字可以是对象，但没有必要将数字创建为对象。</p> <p id="demo"></p> <script> var x = 123; var y = new Number(123); document.getElementById("demo").innerHTML = typeof x + "<br>" + typeof y; </script> </body> </html>