// 减
  FloatSub: function (arg1, arg2) {
    var r1, r2, m, n;
    try {
      r1 = arg1.toString().split(".")[1].length
    } catch (e) {
      r1 = 0
    }
    try {
      r2 = arg2.toString().split(".")[1].length
    } catch (e) {
      r2 = 0
    }
    m = Math.pow(10, Math.max(r1, r2));
    //动态控制精度长度
    n = (r1 = r2) ? r1 : r2;
    return ((arg1 * m - arg2 * m) / m).toFixed(2);
  },
  // 加
  FloatAdd: function (arg1, arg2) {
    var r1, r2, m;
    try {
      r1 = arg1.toString().split(".")[1].length
    } catch (e) {
      r1 = 0
    }
    try {
      r2 = arg2.toString().split(".")[1].length
    } catch (e) {
      r2 = 0
    }
    m = Math.pow(10, Math.max(r1, r2));
    return ((arg1 * m + arg2 * m) / m).toFixed(2);
  },
  //浮点数乘法运算
  FloatMul: function (arg1, arg2) {
    var m = 0, s1 = arg1.toString(), s2 = arg2.toString();
    try { m += s1.split(".")[1].length } catch (e) { }
    try { m += s2.split(".")[1].length } catch (e) { }
    return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
  }