val: The number that we want to round. decimals: The number of decimals that the number should be rounded to. Inside our function, weparsed thevalvariable as a float by using JavaScript’sparseFloatfunction. We did this so that our function can also handle string variables. If you fail ...
It will round the number up and down. “e+2”, 2 is for 2 decimal places. var a = 1.005; let b = 2.68678; function roundNum(number){ return +(Math.round(number + "e+2") + "e-2"); } console.log(roundNum(a)) console.log(roundNum(b))Code language: JavaScript (javascript)...
4、四舍五入 如果要求对小数进行四舍五入,请使用 Math.round() 方法,例如: // 四舍五入Math.round(3/2)// 2 除此之外还可以使用toFixed方法来实现,比如: (3/2).toFixed()//2 toFixed(num)返回值为string,把 Number 四舍五入为指定小数位数的数字...
Math.round(x)参数值参数描述 x 必需。必须是数字。返回值类型描述 Number 最接近的整数。技术细节JavaScript 版本: 1.0更多实例实例 把不同的数舍入为最接近的整数: var a=Math.round(2.60); var b=Math.round(2.50); var c=Math.round(2.49); var d=Math.round(-2.60); var e=Math.round(-2.50);...
5 <title>Round a Number Up in JavaScript</title> 6 </head> 7 <body> 8 <script> 9 document.write(Math.ceil(3.5)+"<br>");// Prints: 4 10 document.write(Math.ceil(-5.7)+"<br>");// Prints: -5 11 document.write(Math.ceil(9.99)+"<br>");// Prints: 10 ...
In this tutorial, we are going to learn about How to round a number to 3 decimal places in JavaScript using method. Consider we have a…
function round(num) { var m = Number((Math.abs(num) * 100).toPrecision(15)); return Math.round(m) / 100 * Math.sign(num); } console.log(round(1.005)); Output:1.01 Using the Custom Function to Round a Number To 2 Decimal Places in JavaScript...
Method-3: Round down using the trunc method If you want another static Math method, we make use of the trunc method returns only the integer part of a number (as it removes the decimal number). It works by simply splitting the number from the point of the dot, and return the left si...
其中round()是四舍五入取整，ceil() 是向上取整，floor() 是向下取整，parseInt() 只取整数部分。保...
In this tutorial, we will learn how to round off a number to next multiple of 5 using JavaScript?