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+---
+title: CSSStyleSheet.insertRule()
+slug: Web/API/CSSStyleSheet/insertRule
+translation_of: Web/API/CSSStyleSheet/insertRule
+---
+<div>{{APIRef("CSSOM")}} </div>
+
+<p><strong>CSSStyleSheet.insertRule() </strong>方法新增一個新的 CSS 規則，到當前的樣式表，他伴隨著一些<a href="#Restrictions">限制</a>.  </p>
+
+<p>更明確的說，雖然 <strong>insertRule()</strong> 只是一個 {{domxref("CSSStyleSheet")}} 的方法， 他實際上插入這份規則到 {{domxref("CSSStyleSheet")}}.<em>cssRules</em>, 在 {{domxref("CSSRuleList")}} 之中。</p>
+
+<p>這份規則，必須包含的內容，取決於它的類型： 對於規則集 (rule-sets)，規則同時指定了選擇器和样式聲明。 對於規則 (at-rules)，規則同時指定 at 標識符（ at-identifier ）和規則內容。</p>
+
+<h2 id="Syntax"><em><em>Syntax</em></em></h2>
+
+<pre class="syntaxbox"><em>
+<em>
+<var>stylesheet</var>.insertRule(<var>rule</var>[, <var>index</var>])</em></em></pre>
+
+<h3 id="Parameters"><em><em>Parameters</em></em></h3>
+
+<dl>
+ <dt><em><em>rule</em></em></dt>
+ <dd><em><em>一個  {{domxref("DOMString")}} 包含要被插入的規則，這份規則同時指定了選擇器（ <a href="/en-US/docs/Web/Guide/CSS/Getting_Started/Selectors">selector</a> ）和样式聲明，或 at 標識符 (at-identifier ) 和規則內容。</em></em></dd>
+ <dt><em><em>index {{optional_inline}}</em></em></dt>
+ <dd>
+ <p><em><em>無符號整數，代表在 <em><em>{{domxref("CSSStyleSheet")}}<em>.</em>cssRules </em></em>中插入的位置，其中 index-0 是第一個規則，而 index-max 就是最後一個規則，並且與 CSSStyleSheet 的長度相同。cssRules 在舊的實現中是必需的。查詢「瀏覽器兼容」取得詳細信息。 默認值為 0。</em></em></p>
+ </dd>
+</dl>
+
+<h3 id="Return_value"><em><em><em><em>Return value</em></em></em></em></h3>
+
+<p><em><em><em><em>The index within the style sheet's rule-list of the newly inserted rule.</em></em></em></em></p>
+
+<h3 id="Restrictions_限制"><em><em><em><em>Restrictions  限制</em></em></em></em></h3>
+
+<p><em><em>CSS 樣式表規則列表，有一些直覺的、和不是那麼直覺的<a href="https://drafts.csswg.org/cssom/#insert-a-css-rule">限制</a> ，影響著規則的插入方式和位置。<br>
+ 違反這些可能會導致 DOM 異常 ({{domxref("DOMException")}}) 引發錯誤。</em></em></p>
+
+<ul>
+ <li><em><em><em><em>如果 index &gt; 樣式表中規則數量 (`CSSRuleList.length`)，他會中止，顯示 IndexSizeError (索引大小錯誤)。</em></em></em></em></li>
+ <li><em><em><em><em>如果 rule 無法在索引 0 插入，因為一些 CSS 因素的限制，他會中止，顯示 HierarchyRequestError (層次結構請求錯誤)。</em></em></em></em></li>
+ <li><em><em><em><em>如果規則參數中給出多個規則，他會中止，顯示 SyntaxError (語法錯誤)。</em></em></em></em></li>
+ <li><em><em><em><em>如果嘗試在樣式規則之後插入 `@import at-rule`，他會中止，顯示 HierarchyRequestError (層次結構請求錯誤)。</em></em></em></em></li>
+ <li><em><em><em><em>如果規則是 `@namespace at-rule`，且列表不只有 `@import at-rules` 和 / 或 `@namespace at-rules`他會中止，顯示 InvalidStateError (狀態錯誤無效)。</em></em></em></em></li>
+</ul>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Example_1">Example 1</h3>
+
+<pre class="brush: js">// push a new rule onto the top of my stylesheet
+myStyle.insertRule("#blanc { color: white }", 0);
+</pre>
+
+<h3 id="Example_2">Example 2</h3>
+
+<pre class="brush: js">/**
+ * Add a stylesheet rule to the document (may be better practice, however,
+ * to dynamically change classes, so style information can be kept in
+ * genuine stylesheets (and avoid adding extra elements to the DOM))
+ * Note that an array is needed for declarations and rules since ECMAScript does
+ * not afford a predictable object iteration order and since CSS is
+ * order-dependent (i.e., it is cascading); those without need of
+ * cascading rules could build a more accessor-friendly object-based API.
+ * @param {Array} rules Accepts an array of JSON-encoded declarations
+ * @example
+addStylesheetRules([
+  ['h2', // Also accepts a second argument as an array of arrays instead
+    ['color', 'red'],
+    ['background-color', 'green', true] // 'true' for !important rules
+  ],
+  ['.myClass',
+    ['background-color', 'yellow']
+  ]
+]);
+ */
+function addStylesheetRules (rules) {
+  var styleEl = document.createElement('style'),
+      styleSheet;
+
+  // Append style element to head
+  document.head.appendChild(styleEl);
+
+  // Grab style sheet
+  styleSheet = styleEl.sheet;
+
+  for (var i = 0, rl = rules.length; i &lt; rl; i++) {
+    var j = 1, rule = rules[i], selector = rules[i][0], propStr = '';
+    // If the second argument of a rule is an array of arrays, correct our variables.
+    if (Object.prototype.toString.call(rule[1][0]) === '[object Array]') {
+      rule = rule[1];
+      j = 0;
+    }
+
+    for (var pl = rule.length; j &lt; pl; j++) {
+      var prop = rule[j];
+      propStr += prop[0] + ':' + prop[1] + (prop[2] ? ' !important' : '') + ';\n';
+    }
+
+    // Insert CSS Rule
+    styleSheet.insertRule(selector + '{' + propStr + '}', styleSheet.cssRules.length);
+  }
+}</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>{{SpecName('CSSOM', '#dom-cssstylesheet-insertrule', 'CSSStyleSheet.insertRule')}}</td>
+   <td>{{Spec2('CSSOM')}}</td>
+   <td>No change from {{SpecName('DOM2 Style')}}.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Style', 'css.html#CSS-CSSStyleSheet-insertRule', 'CSSStyleSheet.insertRule')}}</td>
+   <td>{{Spec2('DOM2 Style')}}</td>
+   <td>Initial definition</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>Edge</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>9</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>index</code> is optional</td>
+   <td>{{CompatChrome(60)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatOpera(47)}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android Webview</th>
+   <th>Chrome for Android</th>
+   <th>Edge</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>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>index</code> is optional</td>
+   <td>{{CompatChrome(60)}}</td>
+   <td>{{CompatChrome(60)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatOperaMobile(47)}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="Legacy_browser_support">Legacy browser support</h3>
+
+<ul>
+ <li>
+  <h4 id="Internet_Explorer_-_pre_v9"><strong>Internet Explorer - pre v9</strong></h4>
+  <strong>addRule</strong>(<var>selector</var>, <var>rule</var> [, <var>index</var>]);  --  Example:<code> addRule('pre', 'font: 14px verdana'); // add rule at end</code><br>
+  <br>
+  <em>Also note the non-standard <code><a class="external" href="http://www.quirksmode.org/dom/w3c_css.html#change">removeRule()</a> </code> and <code><a class="external" href="http://www.quirksmode.org/dom/w3c_css.html#access">.rules</a> </code> instead of {{domxref("CSSStyleSheet.deleteRule","deleteRule()")}}  and {{domxref("CSSStyleSheet",".cssRules")}}  respectively.</em></li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("CSSStyleSheet.deleteRule")}}</li>
+ <li><a class="external" href="http://www-archive.mozilla.org/docs/web-developer/css1technote/css1tojs.html#priority">Cross-Browser CSS-rules ordering (CSS1)</a></li>
+ <li><a class="external" href="http://www.quirksmode.org/dom/w3c_css.html">Quirksmode - CSS</a></li>
+</ul>