admin/src/utils/index.jsx

let toNonExponential = (num) => {
  var m = num.toExponential().match(/\d(?:\.(\d*))?e([+-]\d+)/);
  return num.toFixed(Math.max(0, (m[1] || "").length - m[2]));
};

/**
 * 乘法 - js运算精度丢失问题
 * @param arg1  数1
 * @param arg2  数2
 * 0.0023 * 100 ==> 0.22999999999999998
 * {{ 0.0023 | multiply(100) }} ==> 0.23
 */
export const floatMultiply = (arg1, arg2) => {
  console.log("==222==");
  arg1 = Number(arg1);
  arg2 = Number(arg2);
  if ((!arg1 && arg1 !== 0) || (!arg2 && arg2 !== 0)) {
    return null;
  }
  arg1 = toNonExponential(arg1);
  arg2 = toNonExponential(arg2);
  let n1, n2;
  let r1, r2; // 小数位数
  try {
    r1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    r2 = 0;
  }
  n1 = Number(arg1.toString().replace(".", ""));
  n2 = Number(arg2.toString().replace(".", ""));
  return (n1 * n2) / Math.pow(10, r1 + r2);
};

/**
 * 除法 - js运算精度丢失问题
 * @param arg1  数1
 * @param arg2  数2
 * 0.0023 / 0.00001 ==> 229.99999999999997
 * {{ 0.0023 | divide(0.00001) }} ==> 230
 */
 export const floatDivide = (arg1, arg2) => {
    arg1 = Number(arg1);
    arg2 = Number(arg2);
    if (!arg2) {
        return null;
    }
    if (!arg1 && arg1!==0) {
        return null;
    }else if(arg1===0) {
        return 0;
    }
    arg1 = toNonExponential(arg1);
    arg2 = toNonExponential(arg2);
    let n1, n2;
    let r1, r2; // 小数位数
    try {
        r1 = arg1.toString().split(".")[1].length;
    } catch (e) {
        r1 = 0;
    }
    try {
        r2 = arg2.toString().split(".")[1].length;
    } catch (e) {
        r2 = 0;
    }
    n1 = Number(arg1.toString().replace(".", ""));
    n2 = Number(arg2.toString().replace(".", ""));
    return floatMultiply((n1 / n2), Math.pow(10, r2 - r1));
    // return (n1 / n2) * Math.pow(10, r2 - r1);   // 直接乘法还是会出现精度问题
}