JavaScript的Math对象包含了一个round方法用于对数字进行四舍五入操作,下面的代码详细演示了其用法
<!DOCTYPE html> <html> <body> <p id="demo">Click the button to round the number 2.5 to its nearest integer.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("demo").innerHTML=Math.round(2.5); } </script> </body> </html>