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- {"code":"/**\r\n * @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。\r\n * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998\r\n */\r\n/**\r\n * 把错误的数据转正\r\n * strip(0.09999999999999998)=0.1\r\n */\r\nfunction strip(num, precision) {\r\n if (precision === void 0) { precision = 12; }\r\n return +parseFloat(num.toPrecision(precision));\r\n}\r\n/**\r\n * Return digits length of a number\r\n * @param {*number} num Input number\r\n */\r\nfunction digitLength(num) {\r\n // Get digit length of e\r\n var eSplit = num.toString().split(/[eE]/);\r\n var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));\r\n return len > 0 ? len : 0;\r\n}\r\n/**\r\n * 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\r\n * @param {*number} num 输入数\r\n */\r\nfunction float2Fixed(num) {\r\n if (num.toString().indexOf('e') === -1) {\r\n return Number(num.toString().replace('.', ''));\r\n }\r\n var dLen = digitLength(num);\r\n return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;\r\n}\r\n/**\r\n * 检测数字是否越界，如果越界给出提示\r\n * @param {*number} num 输入数\r\n */\r\nfunction checkBoundary(num) {\r\n if (_boundaryCheckingState) {\r\n if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {\r\n console.warn(num + \" is beyond boundary when transfer to integer, the results may not be accurate\");\r\n }\r\n }\r\n}\r\n/**\r\n * 精确乘法\r\n */\r\nfunction times(num1, num2) {\r\n var others = [];\r\n for (var _i = 2; _i < arguments.length; _i++) {\r\n others[_i - 2] = arguments[_i];\r\n }\r\n if (others.length > 0) {\r\n return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));\r\n }\r\n var num1Changed = float2Fixed(num1);\r\n var num2Changed = float2Fixed(num2);\r\n var baseNum = digitLength(num1) + digitLength(num2);\r\n var leftValue = num1Changed * num2Changed;\r\n checkBoundary(leftValue);\r\n return leftValue / Math.pow(10, baseNum);\r\n}\r\n/**\r\n * 精确加法\r\n */\r\nfunction plus(num1, num2) {\r\n var others = [];\r\n for (var _i = 2; _i < arguments.length; _i++) {\r\n others[_i - 2] = arguments[_i];\r\n }\r\n if (others.length > 0) {\r\n return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));\r\n }\r\n var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));\r\n return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;\r\n}\r\n/**\r\n * 精确减法\r\n */\r\nfunction minus(num1, num2) {\r\n var others = [];\r\n for (var _i = 2; _i < arguments.length; _i++) {\r\n others[_i - 2] = arguments[_i];\r\n }\r\n if (others.length > 0) {\r\n return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));\r\n }\r\n var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));\r\n return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;\r\n}\r\n/**\r\n * 精确除法\r\n */\r\nfunction divide(num1, num2) {\r\n var others = [];\r\n for (var _i = 2; _i < arguments.length; _i++) {\r\n others[_i - 2] = arguments[_i];\r\n }\r\n if (others.length > 0) {\r\n return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));\r\n }\r\n var num1Changed = float2Fixed(num1);\r\n var num2Changed = float2Fixed(num2);\r\n checkBoundary(num1Changed);\r\n checkBoundary(num2Changed);\r\n // fix: 类似 10 ** -4 为 0.00009999999999999999，strip 修正\r\n return times((num1Changed / num2Changed), strip(Math.pow(10, digitLength(num2) - digitLength(num1))));\r\n}\r\n/**\r\n * 四舍五入\r\n */\r\nfunction round(num, ratio) {\r\n var base = Math.pow(10, ratio);\r\n return divide(Math.round(times(num, base)), base);\r\n}\r\nvar _boundaryCheckingState = true;\r\n/**\r\n * 是否进行边界检查，默认开启\r\n * @param flag 标记开关，true 为开启，false 为关闭，默认为 true\r\n */\r\nfunction enableBoundaryChecking(flag) {\r\n if (flag === void 0) { flag = true; 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