加减乘除精确方法

最新推荐文章于 2024-08-05 08:30:00 发布

转载最新推荐文章于 2024-08-05 08:30:00 发布 · 4.1k 阅读

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#加减乘除精度计算 #0.1+0.2

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加减乘除精确方法

能精确到: 0.1 + 0.2 = 0.3哦

转载大神，请各位多多指教

 /**
 * 加法
 * */
    function add (arg1, arg2) {
        var r1, r2, m, c;
        try {
            r1 = arg1.toString().split(".")[1].length
        } catch (e) {
            r1 = 0
        }
        try {
            r2 = arg2.toString().split(".")[1].length
        } catch (e) {
            r2 = 0
        }
        c = Math.abs(r1 - r2);
        m = Math.pow(10, Math.max(r1, r2))
        if (c > 0) {
            var cm = Math.pow(10, c);
            if (r1 > r2) {
                arg1 = Number(arg1.toString().replace(".", ""));
                arg2 = Number(arg2.toString().replace(".", "")) * cm;
            } else {
                arg1 = Number(arg1.toString().replace(".", "")) * cm;
                arg2 = Number(arg2.toString().replace(".", ""));
            }
        } else {
            arg1 = Number(arg1.toString().replace(".", ""));
            arg2 = Number(arg2.toString().replace(".", ""));
        }
        return (arg1 + arg2) / m
    }


    /**
     * 减法
     */
    function minus (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));
        //last modify by deeka
        //动态控制精度长度
        n = (r1 >= r2) ? r1 : r2;
        return ((arg1 * m - arg2 * m) / m).toFixed(n);
    }


    /**
    * 乘法
    */
     function Multipy(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)
     }


     /**
      * 除法
      */
     function Divide(arg1, arg2) {
         var t1 = 0,
             t2 = 0,
             r1, r2;
         try {
             t1 = arg1.toString().split(".")[1].length
         } catch (e) {}
         try {
             t2 = arg2.toString().split(".")[1].length
         } catch (e) {}
         with(Math) {
             r1 = Number(arg1.toString().replace(".", ""))
             r2 = Number(arg2.toString().replace(".", ""))
             return (r1 / r2) * pow(10, t2 - t1);
         }
     }