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+---
+title: Date.prototype.toISOString()
+slug: Web/JavaScript/Reference/Global_Objects/Date/toISOString
+translation_of: Web/JavaScript/Reference/Global_Objects/Date/toISOString
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>toISOString()</strong></code> 方法返回一个 ISO（<a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601 Extended Format</a>）格式的字符串： <strong>YYYY-MM-DDTHH:mm:ss.sssZ</strong>。时区总是UTC（协调世界时），加一个后缀“Z”标识。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/date-toisostring.html")}}</div>
+
+
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><var>dateObj</var>.toISOString()</pre>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">var today = new Date("05 October 2011 14:48 UTC");
+alert(today.toISOString()); // 返回2011-10-05T14:48:00.000Z
+</pre>
+
+<p>上例使用了非标准字符串的解析，该字符串在某些旧的浏览器（如IE）中可能无法被正确解析。</p>
+
+<h2 id="Description" name="Description">Polyfill</h2>
+
+<p>该方法在ECMA-262第5版中被标准化。对于那些不支持此方法的JS引擎可以通过加上下面的代码实现：</p>
+
+<pre class="brush:js">if ( !Date.prototype.toISOString ) {
+  ( function() {
+
+    function pad(number) {
+      if ( number &lt; 10 ) {
+        return '0' + number;
+      }
+      return number;
+    }
+
+    Date.prototype.toISOString = function() {
+      return this.getUTCFullYear() +
+        '-' + pad( this.getUTCMonth() + 1 ) +
+        '-' + pad( this.getUTCDate() ) +
+        'T' + pad( this.getUTCHours() ) +
+        ':' + pad( this.getUTCMinutes() ) +
+        ':' + pad( this.getUTCSeconds() ) +
+        '.' + (this.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) +
+        'Z';
+    };
+
+  }() );
+}</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>{{SpecName('ES5.1', '#sec-15.9.5.43', 'Date.prototype.toISOString')}}<br>
+    Implemented in JavaScript 1.8</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-date.prototype.toisostring', 'Date.prototype.toISOString')}}</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 class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Date.toISOString")}}</p>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Date.prototype.toLocaleDateString()")}}</li>
+ <li>{{jsxref("Date.prototype.toTimeString()")}}</li>
+ <li>{{jsxref("Date.prototype.toUTCString()")}}</li>
+</ul>