/*** @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 evar 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;
}