js 自定义加减乘除方法（防止js自身计算错误）

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/** * 乘法 * @param arg1 * @param arg2 * @returns {Number} */function accMul(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 * @param arg1 * @param arg2 * @returns {Number} */function accDiv(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);    }}/** * 加法 * @param arg1 * @param arg2 * @returns {Number} */function accAdd(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 * @param arg1 * @param arg2 * @returns */function accSub(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);}

调用示例

alert(accMul(7.88,0.8));//乘法
alert(accDiv(7.88,0.8).toFixed(2));//除法
alert(accAdd(7.88,0.8));//加法
alert(accSub(7.88,0.8));//减法

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