tofixed

var myNumber=12.2345;
var myNumberWithTwoDecimalPlaces=parseFloat(myNumber).toFixed(2); //12.23

var num = 2;
var roundedString = num.toFixed(2);// 2.00

//round number to 2 digits
var num = 5.56789;
var n = num.toFixed(2);

var a = 3.3445;
var c = a.toFixed(1); console.log(c); /* result ->*/ 3.3
var g = a.toFixed(4); console.log(g); /* result ->*/ 3.3445
var g = a.toFixed(7); console.log(g); /* result ->*/ 3.3445000
 //               ^                                    ^^^^^^^
/*Syntax ->*/ number.toFixed([digits])
// like Me ;D . My company : Rnad 

<script language="JavaScript" type="text/javascript"> 
var a = 3.3445;
var c = a.toFixed(1);
alert(c);
</script>