js precise addition, subtraction, multiplication and division examples

The following editor will bring you an articlejsPrecise examples of addition, subtraction, multiplication and division, which have a very good reference and value for learning js. I hope to be helpful. If you are interested in js, please follow the editor to take a look.

The examples are as follows:

(function () {
 var calc = {
  /*
  函数，加法函数，用来得到精确的加法结果 
  说明：javascript的加法结果会有误差，在两个浮点数相加的时候会比较明显。这个函数返回较为精确的加法结果。
  参数：arg1：第一个加数；arg2第二个加数；d要保留的小数位数（可以不传此参数，如果不传则不处理小数位数）
  调用：Calc.Add(arg1,arg2,d) 
  返回值：两数相加的结果
  */
  Add: function (arg1, arg2) {
   arg1 = arg1.toString(), arg2 = arg2.toString();
   var arg1Arr = arg1.split("."), arg2Arr = arg2.split("."), d1 = arg1Arr.length == 2 ? arg1Arr[1] : "", d2 = arg2Arr.length == 2 ? arg2Arr[1] : "";
   var maxLen = Math.max(d1.length, d2.length);
   var m = Math.pow(10, maxLen);
   var result = Number(((arg1 * m + arg2 * m) / m).toFixed(maxLen));
   var d = arguments[2];
   return typeof d === "number" ? Number((result).toFixed(d)) : result;
  },
  /*
  函数：减法函数，用来得到精确的减法结果 
  说明：函数返回较为精确的减法结果。 
  参数：arg1：第一个加数；arg2第二个加数；d要保留的小数位数（可以不传此参数，如果不传则不处理小数位数
  调用：Calc.Sub(arg1,arg2) 
  返回值：两数相减的结果
  */
  Sub: function (arg1, arg2) {
   return Calc.Add(arg1, -Number(arg2), arguments[2]);
  },
  /*
  函数：乘法函数，用来得到精确的乘法结果 
  说明：函数返回较为精确的乘法结果。 
  参数：arg1：第一个乘数；arg2第二个乘数；d要保留的小数位数（可以不传此参数，如果不传则不处理小数位数)
  调用：Calc.Mul(arg1,arg2) 
  返回值：两数相乘的结果
  */
  Mul: function (arg1, arg2) {
   var r1 = arg1.toString(), r2 = arg2.toString(), m, resultVal, d = arguments[2];
   m = (r1.split(".")[1] ? r1.split(".")[1].length : 0) + (r2.split(".")[1] ? r2.split(".")[1].length : 0);
   resultVal = Number(r1.replace(".", "")) * Number(r2.replace(".", "")) / Math.pow(10, m);
   return typeof d !== "number" ? Number(resultVal) : Number(resultVal.toFixed(parseInt(d)));
  },
  /*
  函数：除法函数，用来得到精确的除法结果 
  说明：函数返回较为精确的除法结果。 
  参数：arg1：除数；arg2被除数；d要保留的小数位数（可以不传此参数，如果不传则不处理小数位数)
  调用：Calc.p(arg1,arg2) 
  返回值：arg1除于arg2的结果
  */
  p: function (arg1, arg2) {
   var r1 = arg1.toString(), r2 = arg2.toString(), m, resultVal, d = arguments[2];
   m = (r2.split(".")[1] ? r2.split(".")[1].length : 0) - (r1.split(".")[1] ? r1.split(".")[1].length : 0);
   resultVal = Number(r1.replace(".", "")) / Number(r2.replace(".", "")) * Math.pow(10, m);
   return typeof d !== "number" ? Number(resultVal) : Number(resultVal.toFixed(parseInt(d)));
  }
 };
 window.Calc = calc;
}());

I have tested it and it can be used directly!

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