blocks|key|907595|text|有一个exponentiation+operator，它是ES7最终规范的一部分。它的工作方式应该与python和matlab类似：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|907596|a**b+//+will+rise+a+to+the+power+b|code-block|syntax|javascript|907597|现在它已经是implemented+in+Edge14,+Chrome52了，而且还可以使用traceur或babel。|907598|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Exponentiation_assignment|1|http://kangax.github.io/compat-table/es2016plus/#test-exponentiation_(**)_operator)^0|3|N|0|0|0|6|V|1|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]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

There is an <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Exponentiation_assignment" rel="noreferrer">exponentiation operator</a>, which is part of the ES7 final specification. It is supposed to work in a similar manner with python and matlab:

<pre><code>a**b // will rise a to the power b
</code></pre>

Now it is already <a href="http://kangax.github.io/compat-table/es2016plus/#test-exponentiation_(**)_operator" rel="noreferrer">implemented in Edge14, Chrome52</a>, and also it is available with traceur or babel.

blocks|key|691347|text|Math.pow()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|691348|js>+Math.pow(12,+2)
144|code-block|syntax|javascript|691349|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Math/pow^0|0|A|0|A|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

blocks|key|691376|text|首先是Math.pow(base,+exponent)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|691377|示例：|691378|Math.pow(12,+2)|code-block|syntax|javascript|691379|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/0xhwcwy6%2528v=vs.94%2529.aspx^0|3|O|3|O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

<a href="http://msdn.microsoft.com/en-us/library/0xhwcwy6%28v=vs.94%29.aspx"><code>Math.pow(base, exponent)</code></a>, for starters.

Example:

<pre><code>Math.pow(12, 2)
</code></pre>

blocks|key|691436|text|Math.pow(x,+y)适用于x%5Ey，甚至在y不是整数时计算表达式。一段不依赖于Math.pow但只能计算整数指数的代码是：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|691437|function+exp(base,+exponent)+{
++exponent+=+Math.round(exponent);
++if+(exponent+==+0)+{
++++return+1;
++}
++if+(exponent+<+0)+{
++++return+1+/+exp(base,+-exponent);
++}
++if+(exponent+>+0)+{
++++return+base+*+exp(base,+exponent+-+1)
++}
}|code-block|syntax|javascript|691438|entityMap^0|0|E|16|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

<code>Math.pow(x, y)</code> works fine for x^y and even evaluates the expression when y is not an integer. A piece of code not relying on <code>Math.pow</code> but that can only evaluate integer exponents is:

<pre><code>function exp(base, exponent) {
 exponent = Math.round(exponent);
 if (exponent == 0) {
 return 1;
 }
 if (exponent &lt; 0) {
 return 1 / exp(base, -exponent);
 }
 if (exponent &gt; 0) {
 return base * exp(base, exponent - 1)
 }
}
</code></pre>

blocks|key|691551|text|工作示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|691552|​|691553|var+a+=+10;
var+b+=+4;

console.log("Using+Math.pow():",+Math.pow(a,b));+//+10x10x10x10
console.log("Using+**+operator:",+a**b);++//+10x10x10x10|code-block|syntax|javascript|691554|691555|您可以使用Math.pow()或**运算符|offset|length|style|CODE|691556|entityMap^0|0|0|0|0|5|A|G|2|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|V|8|@$L|W|M|X|N|O]|$L|Y|M|Z|N|O]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|Q|$]]

Working Example:
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var a = 10;
var b = 4;

console.log("Using Math.pow():", Math.pow(a,b)); // 10x10x10x10
console.log("Using ** operator:", a**b); // 10x10x10x10</code></pre>
</div>
</div>

You can use either <code>Math.pow()</code> or <code>**</code> operator

blocks|key|691579|text|Math.pow函数已弃用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|691580|Math.pow(a,b)|code-block|syntax|javascript|691581|所以最好使用指数赋值**，如下所示：|691582|a**b|691583|示例：|691584|const+postMoneyValuationRevenue+=+Math.round(
++++++exitValueRevenue+/+(1+%2B+returnRatePercentage+/+100)+**+exitYear,
++++);|691585|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Math.pow function is deprecated
<pre><code>Math.pow(a,b)
</code></pre>
So better to use the exponentiation assignment ** as:
<pre><code>a**b
</code></pre>
Example:
<pre><code>const postMoneyValuationRevenue = Math.round(
 exitValueRevenue / (1 + returnRatePercentage / 100) ** exitYear,
 );
</code></pre>

How do you do exponents in JavaScript?

Like how would you do 12^2?

JavaScript exponents

在JavaScript中如何做指数运算？比如你会怎么做12^2？

问JavaScript指数
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回答 6

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