Revision 492329 of Number.prototype.toFixed()

<div>
 {{JSRef("Global_Objects", "Number")}}</div>
<h2 id="Summary" name="Summary">Summary</h2>
<p>The <code><strong>toFixed()</strong></code> method formats a number using fixed-point notation.</p>
<h2 id="Syntax" name="Syntax">Syntax</h2>
<pre class="syntaxbox">
<code><em>numObj</em>.toFixed(<i>digits</i>)</code></pre>
<h3 id="Parameter" name="Parameter">Parameter</h3>
<dl>
 <dt>
  digits</dt>
 <dd>
  The number of digits to appear after the decimal point; this may be a value between 0 and 20, inclusive, and implementations may optionally support a larger range of values. If this argument is omitted, it is treated as 0.</dd>
</dl>
<h3 id="Returns" name="Returns">Returns</h3>
<p>A string representation of <code>number</code> that does not use exponential notation and has exactly <code>digits</code> digits after the decimal place. The number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. If <code>number</code> is greater than 1e+21, this method simply calls<code> </code>{{jsxref("Global_Objects/Number/toString", "Number.prototype.toString()")}}<code> </code>and returns a string in exponential notation.</p>
<h3 id="Throws" name="Throws">Throws</h3>
<dl>
 <dt>
  {{jsxref("Global_Objects/RangeError", "RangeError")}}</dt>
 <dd>
  If <em>digits</em> is too small or too large. Values between 0 and 20, inclusive, will not cause a <code>RangeError</code>. Implementations are allowed to support larger and smaller values as well.</dd>
</dl>
<dl>
 <dt>
  {{jsxref("Global_Objects/TypeError", "TypeError")}}</dt>
 <dd>
  If this method is invoked on an object that is not a <code>Number</code>.</dd>
</dl>
<h2 id="Example" name="Example">Examples</h2>
<pre class="brush: js">
var numObj = 12345.6789;

numObj.toFixed();         // Returns "12346": note rounding, no fractional part

numObj.toFixed(1);        // Returns "12345.7": note rounding

numObj.toFixed(6);        // Returns "12345.678900": note added zeros

(1.23e+20).toFixed(2);    // Returns "123000000000000000000.00"

(1.23e-10).toFixed(2);    // Returns "0.00"

2.34.toFixed(1);          // Returns "2.3"

-2.34.toFixed(1);         // Returns -2.3 (due to operator precedence, negative number literals don't return a string...)

(-2.34).toFixed(1);       // Returns "-2.3" (...unless you use parentheses)

</pre>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>ECMAScript 3rd Edition. Implemented in JavaScript 1.5</td>
   <td>Standard</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.7.4.5', 'Number.prototype.toFixed')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td>&nbsp;</td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-number.prototype.tofixed', 'Number.prototype.toFixed')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>&nbsp;</td>
  </tr>
 </tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Chrome</th>
    <th>Firefox (Gecko)</th>
    <th>Internet Explorer</th>
    <th>Opera</th>
    <th>Safari</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<div id="compat-mobile">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Android</th>
    <th>Chrome for Android</th>
    <th>Firefox Mobile (Gecko)</th>
    <th>IE Mobile</th>
    <th>Opera Mobile</th>
    <th>Safari Mobile</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<h2 id="See_Also" name="See_Also">See Also</h2>
<ul>
 <li>{{jsxref("Number.prototype.toExponential()")}}</li>
 <li>{{jsxref("Number.prototype.toPrecision()")}}</li>
 <li>{{jsxref("Number.prototype.toString()")}}</li>
</ul>