JS中Float类型加减乘除的示例代码分享

 //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 Floatp(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);
 }
}