text:  //加    
  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;    
  }    
        
  //减    
  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);    
  }    
         
  //乘    
  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);     
  }     
        
        
  //除   
  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){}     
          
        r1=Number(arg1.toString().replace(".",""));  
     
        r2=Number(arg2.toString().replace(".",""));     
        return (r1/r2)*Math.pow(10,t2-t1);     
  }