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+---
+title: Error.prototype.toString()
+slug: Web/JavaScript/Reference/Global_Objects/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">概述</h2>
+<p><code><strong>toString()</strong></code> 方法返回一个指定的错误对象（Error object）的字符串表示。</p>
+<h2 id="Syntax" name="Syntax">语法</h2>
+<pre class="syntaxbox"><code><em>e</em>.toString();</code></pre>
+<h2 id="Description" name="Description">描述</h2>
+<p>{{jsxref("Error")}} 对象覆盖了 {{jsxref("Object.prototype.toString()")}} 方法。该方法实现如下：（假定 <code>Object</code> 和 <code>String</code> 没有被更改）：</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="Example" name="Example">示例</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="规范">规范</h2>
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范版本</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">注解</th>
+  </tr>
+  <tr>
+   <td>ECMAScript 1st Edition.</td>
+   <td>Standard</td>
+   <td>Initial definition.<br>
+    Implemented in 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="浏览器兼容性">浏览器兼容性</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">相关链接</h2>
+<ul>
+ <li>{{jsxref("Error.prototype.toSource()")}}</li>
+</ul>