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

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+var helperStringRepeat = require('./helperStringRepeat')
+var helperNumberOffsetPoint = require('./helperNumberOffsetPoint')
+
+/**
+ * 数值转字符串，科学计数转字符串
+ * @param { Number } num 数值
+ *
+ * @return {Number}
+ */
+function toNumberString(num) {
+  var rest = '' + num
+  var scienceMatchs = rest.match(/^([-+]?)((\d+)|((\d+)?[.](\d+)?))e([-+]{1})([0-9]+)$/)
+  if (scienceMatchs) {
+    var isNegative = num < 0
+    var absFlag = isNegative ? '-' : ''
+    var intNumStr = scienceMatchs[3] || ''
+    var dIntNumStr = scienceMatchs[5] || ''
+    var dFloatNumStr = scienceMatchs[6] || ''
+    var sciencFlag = scienceMatchs[7]
+    var scienceNumStr = scienceMatchs[8]
+    var floatOffsetIndex = scienceNumStr - dFloatNumStr.length
+    var intOffsetIndex = scienceNumStr - intNumStr.length
+    var dIntOffsetIndex = scienceNumStr - dIntNumStr.length
+    if (sciencFlag === '+') {
+      if (intNumStr) {
+        return absFlag + intNumStr + helperStringRepeat('0', scienceNumStr)
+      }
+      if (floatOffsetIndex > 0) {
+        return absFlag + dIntNumStr + dFloatNumStr + helperStringRepeat('0', floatOffsetIndex)
+      }
+      return absFlag + dIntNumStr + helperNumberOffsetPoint(dFloatNumStr, scienceNumStr)
+    }
+    if (intNumStr) {
+      if (intOffsetIndex > 0) {
+        return absFlag + '0.' + helperStringRepeat('0', Math.abs(intOffsetIndex)) + intNumStr
+      }
+      return absFlag + helperNumberOffsetPoint(intNumStr, intOffsetIndex)
+    }
+    if (dIntOffsetIndex > 0) {
+      return absFlag + '0.' + helperStringRepeat('0', Math.abs(dIntOffsetIndex)) + dIntNumStr + dFloatNumStr
+    }
+    return absFlag + helperNumberOffsetPoint(dIntNumStr, dIntOffsetIndex) + dFloatNumStr
+  }
+  return rest
+}
+
+module.exports = toNumberString