JS中Float类型加减乘除

 //浮点数加法运算

function FloatAdd(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;

}

//浮点数减法运算

function FloatSub(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(n);

}

//浮点数乘法运算

function FloatMul(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);

}

 //浮点数除法运算

function FloatDiv(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);

    }

}

链接:https://blog.csdn.net/East_MrChiu/article/details/63685345