blocks|key|1070665|text|var+result+=+(35.8+/+100)+*+10000;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1070666|(感谢jball对操作顺序的更改。我没有考虑过它)。|unstyled|offset|length|1070667|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/223391/jball^0|0|3|5|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>var result = (35.8 / 100) * 10000;
</code></pre>

(Thank you <a href="https://stackoverflow.com/users/223391/jball">jball</a> for this change of order of operations. I didn't consider it).

blocks|key|856310|text|你的百分比除以100+(得到0到1之间的百分比)乘以数字|type|unstyled|depth|inlineStyleRanges|entityRanges|data|856311|35.8/100*10000|code-block|syntax|javascript|856312|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Your percentage divided by 100 (to get the percentage between 0 and 1) times by the number

<pre><code>35.8/100*10000
</code></pre>

blocks|key|856327|text|这就是我要做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|856328|//+num+is+your+number
//+amount+is+your+percentage
function+per(num,+amount){
++return+num*amount/100;
}

...
<html+goes+here>
...

alert(per(10000,+35.8));|code-block|syntax|javascript|856329|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is what I would do:

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

...
&lt;html goes here&gt;
...

alert(per(10000, 35.8));
</code></pre>

blocks|key|1070839|text|如果要将%25作为函数的一部分进行传递，则应使用以下替代方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1070840|<script>
function+fpercentStr(quantity,+percentString)
{
++++var+percent+=+new+Number(percentString.replace("%25",+""));
++++return+fpercent(quantity,+percent);
}

function+fpercent(quantity,+percent)
{
++++return+quantity+*+percent+/+100;
}
document.write("test+1:++"+%2B+fpercent(10000,+35.873))
document.write("test+2:++"+%2B+fpercentStr(10000,+"35.873%25"))
</script>|code-block|syntax|javascript|1070841|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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

<pre><code>&lt;script&gt;
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%"))
&lt;/script&gt;
</code></pre>

blocks|key|856403|text|var+number+=+10000;
var+result+=+.358+*+number;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|856404|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre class="lang-js prettyprint-override"><code>var number = 10000;
var result = .358 * number;
</code></pre>

blocks|key|856445|text|我使用了两个非常有用的JS函数：http://blog.bassta.bg/2013/05/rangetopercent-and-percenttorange/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|856446|function+rangeToPercent(number,+min,+max){
+++return+((number+-+min)+/+(max+-+min));
}|code-block|syntax|javascript|856447|和|856448|function+percentToRange(percent,+min,+max)+{
+++return((max+-+min)+*+percent+%2B+min);
}|856449|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.bassta.bg/2013/05/rangetopercent-and-percenttorange/^0|G|1S|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

I use two very useful JS functions:
<a href="http://blog.bassta.bg/2013/05/rangetopercent-and-percenttorange/" rel="noreferrer">http://blog.bassta.bg/2013/05/rangetopercent-and-percenttorange/</a>

<pre><code>function rangeToPercent(number, min, max){
 return ((number - min) / (max - min));
}
</code></pre>

and

<pre><code>function percentToRange(percent, min, max) {
 return((max - min) * percent + min);
}
</code></pre>

blocks|key|856504|text|它的数字转换可能有点书呆子气/多余，但这里有一个安全的函数来计算给定数字的百分比：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|856505|function+getPerc(num,+percent)+{
++++return+Number(num)+-+((Number(percent)+/+100)+*+Number(num));
}

//+Usage:+getPerc(10000,+25);|code-block|syntax|javascript|856506|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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

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

// Usage: getPerc(10000, 25);
</code></pre>

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)

javascript: calculate x% of a number

我想知道在javascript中，如果我得到一个数字(比如10000)，然后又得到一个百分比(比如35.8%)，我会怎么做？我如何计算出这是多少(例如3580)

问javascript:计算数字的x%
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