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+---
+title: Error.prototype.toString()
+slug: Web/JavaScript/Referencia/Objectes_globals/Error/toString
+translation_of: Web/JavaScript/Reference/Global_Objects/Error/toString
+---
+<div>{{JSRef("Global_Objects", "Error", "EvalError,InternalError,RangeError,ReferenceError,SyntaxError,TypeError,URIError")}}</div>
+
+<h2 id="Summary" name="Summary">Resum</h2>
+
+<p>El mètode <code><strong>toString()</strong></code> retorna un string que representa l'error especificat per l'objecte {{jsxref("Error")}}.</p>
+
+<h2 id="Syntax" name="Syntax">Sintaxi</h2>
+
+<pre class="syntaxbox"><code><var>e</var>.toString()</code></pre>
+
+<h2 id="Description" name="Description">Descripció</h2>
+
+<p>L'objecte {{jsxref("Error")}} sobreescriu el mètode {{jsxref("Object.prototype.toString()")}} heretat per tots els objectes. La seva semàntica és la següent (suposant que {{jsxref("Object")}} i {{jsxref("String")}} tenen els seus valors originals):</p>
+
+<pre class="brush: js">Error.prototype.toString = function() {
+  'use strict';
+
+  var obj = Object(this);
+  if (obj !== this) {
+    throw new TypeError();
+  }
+
+  var name = this.name;
+  name = (name === undefined) ? 'Error' : String(name);
+
+  var msg = this.message;
+  msg = (msg === undefined) ? '' : String(msg);
+
+  if (name === '') {
+    return msg;
+  }
+  if (msg === '') {
+    return name;
+  }
+
+  return name + ': ' + msg;
+};
+</pre>
+
+<h2 id="Examples" name="Examples">Exemples</h2>
+
+<pre class="brush: js">var e = new Error('fatal error');
+print(e.toString()); // 'Error: fatal error'
+
+e.name = undefined;
+print(e.toString()); // 'Error: fatal error'
+
+e.name = '';
+print(e.toString()); // 'fatal error'
+
+e.message = undefined;
+print(e.toString()); // 'Error'
+
+e.name = 'hello';
+print(e.toString()); // 'hello'
+</pre>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificació</th>
+   <th scope="col">Estat</th>
+   <th scope="col">Comentaris</th>
+  </tr>
+  <tr>
+   <td>ECMAScript 1a Edició.</td>
+   <td>Standard</td>
+   <td>Definició inicial. Implementat a JavaScript 1.1.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.11.4.4', 'Error.prototype.toString')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-error.prototype.tostring', 'Error.prototype.toString')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</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>Característica</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>Suport bàsic</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">Vegeu també</h2>
+
+<ul>
+ <li>{{jsxref("Error.prototype.toSource()")}}</li>
+</ul>