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

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+var round = require('./round')
+var toValueString = require('./toValueString')
+
+var helperStringRepeat = require('./helperStringRepeat')
+var helperNumberOffsetPoint = require('./helperNumberOffsetPoint')
+
+/**
+  * 将数值四舍五入并格式化为固定小数位的字符串
+  *
+ * @param {string|number} num 数值
+ * @param {number} digits 小数保留位数
+  * @return {String}
+  */
+function toFixed (num, digits) {
+  digits = digits >> 0
+  var str = toValueString(round(num, digits))
+  var nums = str.split('.')
+  var intStr = nums[0]
+  var floatStr = nums[1] || ''
+  var digitOffsetIndex = digits - floatStr.length
+  if (digits) {
+    if (digitOffsetIndex > 0) {
+      return intStr + '.' + floatStr + helperStringRepeat('0', digitOffsetIndex)
+    }
+    return intStr + helperNumberOffsetPoint(floatStr, Math.abs(digitOffsetIndex))
+  }
+  return intStr
+}
+
+module.exports = toFixed