Revision 481317 of Number.prototype.toFixed()

<div>
  {{JSRef("Global_Objects", "Number")}}</div>
<h2 id="Summary" name="Summary">Summary</h2>
<p>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>Number.toString()</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 numbers 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('ES6', '#sec-number.prototype.tofixed', 'Number.prototype.toFixed')}}</td>
      <td>{{Spec2('ES6')}}</td>
      <td>No change since ES 3rd Edition.</td>
    </tr>
  </tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<div>
  {{CompatibilityTable}}</div>
<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 (WebKit)</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>Firefox Mobile (Gecko)</th>
        <th>IE Phone</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>
      </tr>
    </tbody>
  </table>
</div>
<h2 id="See_Also" name="See_Also">See Also</h2>
<ul>
  <li>{{jsxref("Global_Objects/Number/toExponential", "numObj.toExponential()")}}</li>
  <li>{{jsxref("Global_Objects/Number/toPrecision", "numObj.toPrecision()")}}</li>
  <li>{{jsxref("Global_Objects/Number/toString", "numObj.toString()")}}</li>
</ul>