/*
* 四则运算精度修正函数
* m 数值1(number)
* n 数值2(number)
* op 操作符(string)
*/
function fixMath(m, n, op) {
var a = (m+"");
var b = (n+"");
var x = 1;
var y = 1;
var c = 1;
if(a.indexOf(".")>0) {
x = Math.pow(10, a.length - a.indexOf(".") - 1);
}
if(b.indexOf(".")>0) {
y = Math.pow(10, b.length - b.indexOf(".") - 1);
}
switch(op)
{
case '+':
case '-':
c = Math.max(x,y);
m = Math.round(m*c);
n = Math.round(n*c);
break;
case '*':
c = x*y
m = Math.round(m*x);
n = Math.round(n*y);
break;
case '/':
c = Math.max(x,y);
m = Math.round(m*c);
n = Math.round(n*c);
c = 1;
break;
}
return eval("("+m+op+n+")/"+c);
}
function demicalFloat(numberA,numberB,type)
{
var h=(type=="*")? "+":"-";
var c=[get(numberA),get(numberB)];
var A=c[0][1]; //numberA 的數字
var B=c[1][1]; //numberB 的數字
var pointA=c[0][0]; //numberA 的小數位數
var pointB=c[1][0]; //numberB 的小數位數
if (type=="*" || type=="/")
{
var k1=eval("numberA"+type+"numberB");
var k2=eval("(A"+type+"B)");
if (get(k1)[1]==k2) return k1;
else return (pointA+pointB==0? k1:eval(k2+"/Math.pow(10,pointA"+h+"pointB)"));
}
else if (type=="+" || type=="-")
{
var pointL=pointA;
if (pointA<pointB) pointL=pointB;
numberA=demicalFloat(numberA,Math.pow(10,pointL),"*");
numberB=demicalFloat(numberB,Math.pow(10,pointL),"*");
return eval("numberA"+type+"numberB")/Math.pow(10,pointL);
}
else return "[ Can't calculate! ]"
}
function get(number)
{
number=""+number;
if (number.indexOf(".")==-1) return [0,parseInt(number)];
//小數位數
var po=number.split(".")[1].length;
//轉成整數 4.1 --> 41 , 4.33 --> 433
var st=number.split(".").join("");
//將前置 0 拿掉
for (var i=0;i<st.length;i++) if (st.charAt(0)=="0") st=st.substr(1,st.length);
//傳回一個陣列,陣列 0 存小數位數, 陣列 1 存數字
return [po,parseInt(st)];
}
function tran(){
args=tran.arguments;
var temp=1;
for(i=0;i<args.length;i++)
temp*=args[ i ]*args[ i ].rate();
for(i=0;i<args.length;i++)
temp/=args[ i ].rate();
return temp
}