JS中Float类型加减乘除

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 //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);    }}

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