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[removed] calculate x% of a number

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10 1803
-上瘾入骨i
-上瘾入骨i 2020-12-12 15:07

I am wondering how in javascript if i was given a number (say 10000) and then was given a percentage (say 35.8%)

how would I work out how much that is (eg 3580)

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  • -上瘾入骨i
    2020-12-12 15:31 
    var number = 10000;
var result = .358 * number;
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  • 一向
    2020-12-12 15:31

    It may be a bit pedantic / redundant with its numeric casting, but here's a safe function to calculate percentage of a given number:

    function getPerc(num, percent) {
    return Number(num) - ((Number(percent) / 100) * Number(num));
}

// Usage: getPerc(10000, 25);
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  • 走了就别回头了
    2020-12-12 15:34

    If you want to pass the % as part of your function you should use the following alternative:

    <script>
function fpercentStr(quantity, percentString)
{
    var percent = new Number(percentString.replace("%", ""));
    return fpercent(quantity, percent);
}

function fpercent(quantity, percent)
{
    return quantity * percent / 100;
}
document.write("test 1:  " + fpercent(10000, 35.873))
document.write("test 2:  " + fpercentStr(10000, "35.873%"))
</script>
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  • 一整个雨季
    2020-12-12 15:35

    This is what I would do:

    // num is your number
// amount is your percentage
function per(num, amount){
  return num*amount/100;
}

...
<html goes here>
...

alert(per(10000, 35.8));
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