Javascript VS PHP取整

本文介绍了Javascript VS PHP取整的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在使用PHP和javascript整数的方式时遇到一些问题.我正在使用PHP的round函数和此javascript函数:

I am having some problems with the way PHP and javascript round numbers. I am using PHP's round function and this javascript function:

function roundNumber(number, decimals) { var newnumber = new Number(number+'').toFixed(parseInt(decimals)); var value = parseFloat(newnumber); return value; }

我要四舍五入的数字是43.65 * 2.5 + 40％，当使用计算器完成时= 152.775或在PHP中四舍五入= 152.78.

The number i am trying to round is 43.65 * 2.5 + 40% which when done using a calculator = 152.775 or when rounded in PHP = 152.78.

在javascript中，当我执行console.log时，数字为152.774999999998，当使用上述函数取整后，得出的数字为152.77

In javascript when i do a console.log the number is 152.774999999998 and when rounded with the above function gives me 152.77

感谢您对解决此问题的任何帮助

Any help to reslove this issue is greatly appreciated

推荐答案

请查看如何处理JavaScript中的浮点数精度?

这里是一个示例

function roundNumber(number, decimals) { decimals = parseInt(decimals,10); var dec = Math.pow(10,decimals) console.log(dec,parseFloat(number)*dec); number=""+Math.round(parseFloat(number)*dec+.0000000000001); // fixed the .X99999999999 return parseFloat(number.slice(0,-1*decimals) + "." + number.slice(-1*decimals)) } var val = 43.65 * 2.5; val+= val*0.40 console.log(val+' ~= 152.78? --> '+roundNumber(val,2).toFixed(2)); console.log('15.803 ~= 15.80? --> '+roundNumber(15.803,2).toFixed(2)); console.log('15.805 ~= 15.81? --> '+roundNumber(15.805,2).toFixed(2)); console.log('14.803 ~= 14.80? --> '+roundNumber(14.803,2).toFixed(2)); console.log('0.575 ~= 0.58? --> '+roundNumber(0.575,2).toFixed(2));