<!DOCTYPE html> <html> <body> <h1>JavaScript 数字</h1> <p>书写 JavaScript 数值既可以带小数点，也可以不带：</p> <p id="demo"></p> <script> var x = 3.14; var y = 3; document.getElementById("demo").innerHTML = x + "<br>" + y; </script> </body> </html>
