JavaScript里四舍五入函数round的用法实例 本文实例讲述了JavaScript里四舍五入函数round用法。分享给大家供大家参考。具体如下: JavaScript的Math对象包含了一个round方法用于对数字进行四舍五入*作,下面的代码详细演示了其用法 Clickthebuttontoroundthenumber2.5toitsnearestinteger. Tryit functionmyFunction(){document...
The floor of the scalar `x` is the largest integer `i`, such that `i <= x`. It is often denoted as :math:`\lfloor x \rfloor`. 标量“ x”的下限是最大的整数“ i”,因此“ i <= x”。 它通常表示为:\ lfloor x \ rfloor`。 Parameters --- x : array_like Input data. out...
1、 指定要保留的小数位数(0.1+0.2).toFixed(1) = 0.3;这个方法toFixed是进行四舍五入的也不是很精准,对于计算金额这种严谨的问题,不推荐使用,而且不同浏览器对toFixed的计算结果也存在差异。 2、把需要计算的数字升级(乘以10的n次幂)成计算机能够精确识别的整数,等计算完毕再降级(除以10的n次幂),这是大部分...
JavaScript Code: // Define a function named int_round5 that rounds a number up to the nearest multiple of 5.functionint_round5(num){// Divide the number by 5, round the result up to the nearest integer, then multiply by 5.returnMath.ceil(num/5)*5;}// Output the result of roundin...
具体如下: 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 Clickthebuttontoroundthenumber2.5toitsnearestinteger. Tryit functionmyFunction(){document.getElementById(demo).inn erHTML=Math.round(2.5);} 希望本文所述对大家的 javascript 程序设计有所...
以前没注意,今天要在javascript里保留小数点后2位才发现,javascript真是一个反人类的语言,几乎所有的编程言四舍五入保留点后2位都是round(num,2),javascript的round只有一个参数,仅返回四舍五入取整的数。javascript中保留小数点后2位的操作如下:四舍五入方法1:num=2.34678; num=num.toFixed(2); console.log(...
if (typeof exp === "undefined" || +exp === 0) { return Math[type](value); } value = +value; exp = +exp; // If the value is not a number or the exp is not an integer... if (isNaN(value) || !(typeof exp === "number" && exp % 1 === 0)) { return NaN; } ...
// round the number to nearest integer let roundedNumber = Math.round(number); console.log(roundedNumber); // Output: 4 Run Code Math.round() Syntax The syntax of the Math.round() function is: Math.round(x) round(), being a static method, is called using the Math class name. Mat...
本文实例讲述了JavaScript里四舍五入函数round用法。分享给大家供大家参考。具体如下: 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> Click the button to round the number 2.5 to its nearest integer. Try it [removed...
JavaScript has native methods for rounding numbers, but they only round floats (numbers with decimals) to the nearest whole number. I recently needed a way to round a whole number to the nearest 10, 100, and so on. Let me show you what I did. The backgro