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 accMul((r1/r2),pow(10,t2-t1));

 }

 }

 //乘法

 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)

 }

//加法

function accAdd(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

}

//减法

function Subtr(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));

 n=(r1>=r2)?r1:r2;

 return ((arg1*m-arg2*m)/m).toFixed(n);

}