toFixed精度丢失问题

bug说明：
在这里插入图片描述

10.3950 * 3935.00 用toFixed（2）得到的是40904.32 实际应该是40904.33

解决的方法：
第一种：

在main.js中直接复制下面代码即可

Number.prototype.toFixed = function (n) {n = n || 0let resNum = Math.round((this * Math.pow(10, n + 1)) / 10) / Math.pow(10, n)let resNumString = resNum.toString()let dotIndex = resNumString.indexOf('.')if (dotIndex < 0 && n > 0) {dotIndex = resNumString.lengthresNumString += '.'}while (resNumString.length <= dotIndex + n) {resNumString += '0'}return resNumString
}

第二种：
在main.js中直接复制下面代码即可

// js
if (!Number.prototype._toFixed) {// eslint-disable-next-line no-extend-nativeNumber.prototype._toFixed = Number.prototype.toFixed
}
// eslint-disable-next-line no-extend-native
Number.prototype.toFixed = function (d) {var s = this + "";if (!d) d = 0;if (s.indexOf(".") === -1) s += ".";s += new Array(d + 1).join("0");if (new RegExp("^(-|\\+)?(\\d+(\\.\\d{0," + (d + 1) + "})?)\\d*$").test(s)) {let s = "0" + RegExp.$2; var pm = RegExp.$1; var a = RegExp.$3.length; var b = true;if (a === d + 2) {a = s.match(/\d/g);if (parseInt(a[a.length - 1]) > 4) {for (var i = a.length - 2; i >= 0; i--) {a[i] = parseInt(a[i]) + 1;if (a[i] === 10) {a[i] = 0;b = i !== 1;} else break;}}s = a.join("").replace(new RegExp("(\\d+)(\\d{" + d + "})\\d$"), "$1.$2");}if (b) s = s.substr(1);return (pm + s).replace(/\.$/, "");}return this + "";
};