diff --git a/build/index.iife.js b/build/index.iife.js
index 19e4551..fee012f 100644
--- a/build/index.iife.js
+++ b/build/index.iife.js
@@ -1,129 +1,130 @@
 var NP = (function (exports) {
 'use strict';
 
-/**
- * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
- * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
- */
-/**
- * 把错误的数据转正
- * strip(0.09999999999999998)=0.1
- */
-function strip(num, precision) {
-    if (precision === void 0) { precision = 12; }
-    return +parseFloat(num.toPrecision(precision));
-}
-/**
- * Return digits length of a number
- * @param {*number} num Input number
- */
-function digitLength(num) {
-    // Get digit length of e
-    var eSplit = num.toString().split(/[eE]/);
-    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
-    return len > 0 ? len : 0;
-}
-/**
- * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
- * @param {*number} num 输入数
- */
-function float2Fixed(num) {
-    if (num.toString().indexOf('e') === -1) {
-        return Number(num.toString().replace('.', ''));
-    }
-    var dLen = digitLength(num);
-    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
-}
-/**
- * 检测数字是否越界，如果越界给出提示
- * @param {*number} num 输入数
- */
-function checkBoundary(num) {
-    if (_boundaryCheckingState) {
-        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
-            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
-        }
-    }
-}
-/**
- * 精确乘法
- */
-function times(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var num1Changed = float2Fixed(num1);
-    var num2Changed = float2Fixed(num2);
-    var baseNum = digitLength(num1) + digitLength(num2);
-    var leftValue = num1Changed * num2Changed;
-    checkBoundary(leftValue);
-    return leftValue / Math.pow(10, baseNum);
-}
-/**
- * 精确加法
- */
-function plus(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
-}
-/**
- * 精确减法
- */
-function minus(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
-}
-/**
- * 精确除法
- */
-function divide(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var num1Changed = float2Fixed(num1);
-    var num2Changed = float2Fixed(num2);
-    checkBoundary(num1Changed);
-    checkBoundary(num2Changed);
-    return times((num1Changed / num2Changed), Math.pow(10, digitLength(num2) - digitLength(num1)));
-}
-/**
- * 四舍五入
- */
-function round(num, ratio) {
-    var base = Math.pow(10, ratio);
-    return divide(Math.round(times(num, base)), base);
-}
-var _boundaryCheckingState = true;
-/**
- * 是否进行边界检查，默认开启
- * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
- */
-function enableBoundaryChecking(flag) {
-    if (flag === void 0) { flag = true; }
-    _boundaryCheckingState = flag;
-}
+/**
+ * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
+ * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
+ */
+/**
+ * 把错误的数据转正
+ * strip(0.09999999999999998)=0.1
+ */
+function strip(num, precision) {
+    if (precision === void 0) { precision = 12; }
+    return +parseFloat(num.toPrecision(precision));
+}
+/**
+ * Return digits length of a number
+ * @param {*number} num Input number
+ */
+function digitLength(num) {
+    // Get digit length of e
+    var eSplit = num.toString().split(/[eE]/);
+    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
+    return len > 0 ? len : 0;
+}
+/**
+ * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
+ * @param {*number} num 输入数
+ */
+function float2Fixed(num) {
+    if (num.toString().indexOf('e') === -1) {
+        return Number(num.toString().replace('.', ''));
+    }
+    var dLen = digitLength(num);
+    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
+}
+/**
+ * 检测数字是否越界，如果越界给出提示
+ * @param {*number} num 输入数
+ */
+function checkBoundary(num) {
+    if (_boundaryCheckingState) {
+        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
+            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
+        }
+    }
+}
+/**
+ * 精确乘法
+ */
+function times(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    var baseNum = digitLength(num1) + digitLength(num2);
+    var leftValue = num1Changed * num2Changed;
+    checkBoundary(leftValue);
+    return leftValue / Math.pow(10, baseNum);
+}
+/**
+ * 精确加法
+ */
+function plus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确减法
+ */
+function minus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确除法
+ */
+function divide(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    checkBoundary(num1Changed);
+    checkBoundary(num2Changed);
+    // fix: 类似 10 ** -4 为 0.00009999999999999999，strip 修正
+    return times((num1Changed / num2Changed), strip(Math.pow(10, digitLength(num2) - digitLength(num1))));
+}
+/**
+ * 四舍五入
+ */
+function round(num, ratio) {
+    var base = Math.pow(10, ratio);
+    return divide(Math.round(times(num, base)), base);
+}
+var _boundaryCheckingState = true;
+/**
+ * 是否进行边界检查，默认开启
+ * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
+ */
+function enableBoundaryChecking(flag) {
+    if (flag === void 0) { flag = true; }
+    _boundaryCheckingState = flag;
+}
 var index = { strip: strip, plus: plus, minus: minus, times: times, divide: divide, round: round, digitLength: digitLength, float2Fixed: float2Fixed, enableBoundaryChecking: enableBoundaryChecking };
 
 exports.strip = strip;
diff --git a/build/index.js b/build/index.js
index 283c508..f295d3f 100644
--- a/build/index.js
+++ b/build/index.js
@@ -2,129 +2,130 @@
 
 Object.defineProperty(exports, '__esModule', { value: true });
 
-/**
- * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
- * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
- */
-/**
- * 把错误的数据转正
- * strip(0.09999999999999998)=0.1
- */
-function strip(num, precision) {
-    if (precision === void 0) { precision = 12; }
-    return +parseFloat(num.toPrecision(precision));
-}
-/**
- * Return digits length of a number
- * @param {*number} num Input number
- */
-function digitLength(num) {
-    // Get digit length of e
-    var eSplit = num.toString().split(/[eE]/);
-    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
-    return len > 0 ? len : 0;
-}
-/**
- * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
- * @param {*number} num 输入数
- */
-function float2Fixed(num) {
-    if (num.toString().indexOf('e') === -1) {
-        return Number(num.toString().replace('.', ''));
-    }
-    var dLen = digitLength(num);
-    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
-}
-/**
- * 检测数字是否越界，如果越界给出提示
- * @param {*number} num 输入数
- */
-function checkBoundary(num) {
-    if (_boundaryCheckingState) {
-        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
-            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
-        }
-    }
-}
-/**
- * 精确乘法
- */
-function times(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var num1Changed = float2Fixed(num1);
-    var num2Changed = float2Fixed(num2);
-    var baseNum = digitLength(num1) + digitLength(num2);
-    var leftValue = num1Changed * num2Changed;
-    checkBoundary(leftValue);
-    return leftValue / Math.pow(10, baseNum);
-}
-/**
- * 精确加法
- */
-function plus(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
-}
-/**
- * 精确减法
- */
-function minus(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
-}
-/**
- * 精确除法
- */
-function divide(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var num1Changed = float2Fixed(num1);
-    var num2Changed = float2Fixed(num2);
-    checkBoundary(num1Changed);
-    checkBoundary(num2Changed);
-    return times((num1Changed / num2Changed), Math.pow(10, digitLength(num2) - digitLength(num1)));
-}
-/**
- * 四舍五入
- */
-function round(num, ratio) {
-    var base = Math.pow(10, ratio);
-    return divide(Math.round(times(num, base)), base);
-}
-var _boundaryCheckingState = true;
-/**
- * 是否进行边界检查，默认开启
- * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
- */
-function enableBoundaryChecking(flag) {
-    if (flag === void 0) { flag = true; }
-    _boundaryCheckingState = flag;
-}
+/**
+ * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
+ * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
+ */
+/**
+ * 把错误的数据转正
+ * strip(0.09999999999999998)=0.1
+ */
+function strip(num, precision) {
+    if (precision === void 0) { precision = 12; }
+    return +parseFloat(num.toPrecision(precision));
+}
+/**
+ * Return digits length of a number
+ * @param {*number} num Input number
+ */
+function digitLength(num) {
+    // Get digit length of e
+    var eSplit = num.toString().split(/[eE]/);
+    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
+    return len > 0 ? len : 0;
+}
+/**
+ * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
+ * @param {*number} num 输入数
+ */
+function float2Fixed(num) {
+    if (num.toString().indexOf('e') === -1) {
+        return Number(num.toString().replace('.', ''));
+    }
+    var dLen = digitLength(num);
+    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
+}
+/**
+ * 检测数字是否越界，如果越界给出提示
+ * @param {*number} num 输入数
+ */
+function checkBoundary(num) {
+    if (_boundaryCheckingState) {
+        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
+            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
+        }
+    }
+}
+/**
+ * 精确乘法
+ */
+function times(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    var baseNum = digitLength(num1) + digitLength(num2);
+    var leftValue = num1Changed * num2Changed;
+    checkBoundary(leftValue);
+    return leftValue / Math.pow(10, baseNum);
+}
+/**
+ * 精确加法
+ */
+function plus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确减法
+ */
+function minus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确除法
+ */
+function divide(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    checkBoundary(num1Changed);
+    checkBoundary(num2Changed);
+    // fix: 类似 10 ** -4 为 0.00009999999999999999，strip 修正
+    return times((num1Changed / num2Changed), strip(Math.pow(10, digitLength(num2) - digitLength(num1))));
+}
+/**
+ * 四舍五入
+ */
+function round(num, ratio) {
+    var base = Math.pow(10, ratio);
+    return divide(Math.round(times(num, base)), base);
+}
+var _boundaryCheckingState = true;
+/**
+ * 是否进行边界检查，默认开启
+ * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
+ */
+function enableBoundaryChecking(flag) {
+    if (flag === void 0) { flag = true; }
+    _boundaryCheckingState = flag;
+}
 var index = { strip: strip, plus: plus, minus: minus, times: times, divide: divide, round: round, digitLength: digitLength, float2Fixed: float2Fixed, enableBoundaryChecking: enableBoundaryChecking };
 
 exports.strip = strip;
diff --git a/build/index.js.map b/build/index.js.map
index a8b2b37..c7a16e0 100644
--- a/build/index.js.map
+++ b/build/index.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/build/index.umd.js b/build/index.umd.js
index 75a3603..c1d1016 100644
--- a/build/index.umd.js
+++ b/build/index.umd.js
@@ -4,129 +4,130 @@
 	(factory((global.NP = {})));
 }(this, (function (exports) { 'use strict';
 
-/**
- * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
- * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
- */
-/**
- * 把错误的数据转正
- * strip(0.09999999999999998)=0.1
- */
-function strip(num, precision) {
-    if (precision === void 0) { precision = 12; }
-    return +parseFloat(num.toPrecision(precision));
-}
-/**
- * Return digits length of a number
- * @param {*number} num Input number
- */
-function digitLength(num) {
-    // Get digit length of e
-    var eSplit = num.toString().split(/[eE]/);
-    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
-    return len > 0 ? len : 0;
-}
-/**
- * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
- * @param {*number} num 输入数
- */
-function float2Fixed(num) {
-    if (num.toString().indexOf('e') === -1) {
-        return Number(num.toString().replace('.', ''));
-    }
-    var dLen = digitLength(num);
-    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
-}
-/**
- * 检测数字是否越界，如果越界给出提示
- * @param {*number} num 输入数
- */
-function checkBoundary(num) {
-    if (_boundaryCheckingState) {
-        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
-            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
-        }
-    }
-}
-/**
- * 精确乘法
- */
-function times(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var num1Changed = float2Fixed(num1);
-    var num2Changed = float2Fixed(num2);
-    var baseNum = digitLength(num1) + digitLength(num2);
-    var leftValue = num1Changed * num2Changed;
-    checkBoundary(leftValue);
-    return leftValue / Math.pow(10, baseNum);
-}
-/**
- * 精确加法
- */
-function plus(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
-}
-/**
- * 精确减法
- */
-function minus(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
-}
-/**
- * 精确除法
- */
-function divide(num1, num2) {
-    var others = [];
-    for (var _i = 2; _i < arguments.length; _i++) {
-        others[_i - 2] = arguments[_i];
-    }
-    if (others.length > 0) {
-        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
-    }
-    var num1Changed = float2Fixed(num1);
-    var num2Changed = float2Fixed(num2);
-    checkBoundary(num1Changed);
-    checkBoundary(num2Changed);
-    return times((num1Changed / num2Changed), Math.pow(10, digitLength(num2) - digitLength(num1)));
-}
-/**
- * 四舍五入
- */
-function round(num, ratio) {
-    var base = Math.pow(10, ratio);
-    return divide(Math.round(times(num, base)), base);
-}
-var _boundaryCheckingState = true;
-/**
- * 是否进行边界检查，默认开启
- * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
- */
-function enableBoundaryChecking(flag) {
-    if (flag === void 0) { flag = true; }
-    _boundaryCheckingState = flag;
-}
+/**
+ * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
+ * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
+ */
+/**
+ * 把错误的数据转正
+ * strip(0.09999999999999998)=0.1
+ */
+function strip(num, precision) {
+    if (precision === void 0) { precision = 12; }
+    return +parseFloat(num.toPrecision(precision));
+}
+/**
+ * Return digits length of a number
+ * @param {*number} num Input number
+ */
+function digitLength(num) {
+    // Get digit length of e
+    var eSplit = num.toString().split(/[eE]/);
+    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
+    return len > 0 ? len : 0;
+}
+/**
+ * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
+ * @param {*number} num 输入数
+ */
+function float2Fixed(num) {
+    if (num.toString().indexOf('e') === -1) {
+        return Number(num.toString().replace('.', ''));
+    }
+    var dLen = digitLength(num);
+    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
+}
+/**
+ * 检测数字是否越界，如果越界给出提示
+ * @param {*number} num 输入数
+ */
+function checkBoundary(num) {
+    if (_boundaryCheckingState) {
+        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
+            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
+        }
+    }
+}
+/**
+ * 精确乘法
+ */
+function times(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    var baseNum = digitLength(num1) + digitLength(num2);
+    var leftValue = num1Changed * num2Changed;
+    checkBoundary(leftValue);
+    return leftValue / Math.pow(10, baseNum);
+}
+/**
+ * 精确加法
+ */
+function plus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确减法
+ */
+function minus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确除法
+ */
+function divide(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    checkBoundary(num1Changed);
+    checkBoundary(num2Changed);
+    // fix: 类似 10 ** -4 为 0.00009999999999999999，strip 修正
+    return times((num1Changed / num2Changed), strip(Math.pow(10, digitLength(num2) - digitLength(num1))));
+}
+/**
+ * 四舍五入
+ */
+function round(num, ratio) {
+    var base = Math.pow(10, ratio);
+    return divide(Math.round(times(num, base)), base);
+}
+var _boundaryCheckingState = true;
+/**
+ * 是否进行边界检查，默认开启
+ * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
+ */
+function enableBoundaryChecking(flag) {
+    if (flag === void 0) { flag = true; }
+    _boundaryCheckingState = flag;
+}
 var index = { strip: strip, plus: plus, minus: minus, times: times, divide: divide, round: round, digitLength: digitLength, float2Fixed: float2Fixed, enableBoundaryChecking: enableBoundaryChecking };
 
 exports.strip = strip;
diff --git a/src/index.ts b/src/index.ts
index 3c467ee..b9d39ab 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -96,7 +96,8 @@ function divide(num1: number, num2: number, ...others: number[]): number {
   const num2Changed = float2Fixed(num2);
   checkBoundary(num1Changed);
   checkBoundary(num2Changed);
-  return times((num1Changed / num2Changed), Math.pow(10, digitLength(num2) - digitLength(num1)));
+  // fix: 类似 10 ** -4 为 0.00009999999999999999，strip 修正
+  return times((num1Changed / num2Changed), strip(Math.pow(10, digitLength(num2) - digitLength(num1))));
 }
 
 /**