whole number in javascript?

I get 28.6813276578 when i multiply 2 numbers a and b, how can i make it whole number with less digits

and also, when i multiply again i get results after first reult like 28.681321405.4428.68 how to get only one result ?

<script>
    $(document).ready(function(){
    $("#total").hide();
    $("#form1").submit(function(){

    var a = parseFloat($("#user_price开发者_运维问答").val());
    var b = parseFloat($("#selling").val());
    var total = a*b; 



    $("#total").append(total)
    .show('slow')
    .css({"background":"yellow","font-size":50})
    ;
    return false;   
    });

    });
</script>

You can do several things:

total = total.toFixed([number of decimals]);
total = Math.round(total);
total = parseInt(total);

1. toFixed() will round your number to the number of decimals indicated.

2. Math.round() will round numbers to the nearest integer.

3. parseInt() will take a string and attempt to parse an integer from it without rounding. parseInt() is a little trickier though, in that it will parse the first characters in a string that are numbers until they are not, meaning parseInt('123g32ksj') will return 123, whereas parseInt('sdjgg123') will return NaN.

   • For the sake of completeness, parseInt() accepts a second parameter which can be used to express the base you're trying to extract with, meaning that, for instance,
     parseInt('A', 16) === 10 if you were trying to parse a hexidecimal.

See Math.round(...).

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Math/round

In addition to the other answers about rounding, you are appending the answer to "total" by using

$("#total").append(total)

You need to replace the previous text rather than appending by using

$("#total").html(total)