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20220330_Vote/Ewide.Web.Entry/wwwroot/lib/xe-utils/subtract.js

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+var helperNumberDecimal = require('./helperNumberDecimal')
+var toNumberString = require('./toNumberString')
+var toNumber = require('./toNumber')
+var toFixed = require('./toFixed')
+
+/**
+ * 减法运算
+ *
+ * @param { Number } num1 被减数
+ * @param { Number } num2 减数
+ * @return {Number}
+ */
+function subtract (num1, num2) {
+  var subtrahend = toNumber(num1)
+  var minuend = toNumber(num2)
+  var str1 = toNumberString(subtrahend)
+  var str2 = toNumberString(minuend)
+  var digit1 = helperNumberDecimal(str1)
+  var digit2 = helperNumberDecimal(str2)
+  var ratio = Math.pow(10, Math.max(digit1, digit2))
+  var precision = (digit1 >= digit2) ? digit1 : digit2
+  return parseFloat(toFixed((subtrahend * ratio - minuend * ratio) / ratio, precision))
+}
+
+module.exports = subtract