js format decimal

The best way:

Keep two digits like this
var a = 9.39393;
alert(a.toFixed(2));

Explanation:

alert(Number.toFixed(9.39393));
Returned It is 9.39
But it is only supported by versions above IE5.5.

Other methods:

Method 1:

function roundFun(numberRound,roundDigit) //Rounding, the number of reserved digits is roundDigit {
if (numberRound>=0)
var temp Number = parseInt((numberRound * Math .pow(10,roundDigit)+0.5))/Math.pow(10,roundDigit);
return tempNumber;
}
else
{
numberRound1=-numberRound var tempNumber = parseInt ((numberRound1 * Math.pow(10 ,roundDigit)+0.5))/Math.pow(10,roundDigit);
return -tempNumber;
}
    }

Method 2:

<script> <p> tmp = "1234 567.57232" </p> result = tmp.substr( 0,tmp.indexOf(".")+3); <p> alert(result); <br> </script>