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<!DOCTYPE html> <html> <body> <h2>JavaScript 数值</h2> <p>写数值时用不用小数点均可：</p> <p id="demo"></p> <script> var x1 = 34.00; var x2 = 34; var x3 = 3.14; document.getElementById("demo").innerHTML = x1 + "<br>" + x2 + "<br>" + x3; </script> </body> </html>