--- title: HTMLCollection.item slug: Web/API/HTMLCollection/item translation_of: Web/API/HTMLCollection/item --- <p>{{APIRef("HTML DOM")}}</p> <p><code>HTMLCollection.item()</code> 由位置获取元素.</p> <h3 id="参数">参数</h3> <dl> <dt>index</dt> <dd>想要被返回的Node的位置. 元素在HTML Collection中的顺序和他们在源文档的顺序保持一致。</dd> </dl> <h3 id="返回值">返回值</h3> <p>指定的index的{{domxref("Node")}} , 如果index小于0或者不小于它的长度属性则返回null。</p> <h2 id="Description">Description</h2> <p>HTMLCollection中item( )方法返回一个编号的元素 ,在JavaScript中把HTMLCollection当成是一个是数组并用数组符号去索引十分简单。</p> <h2 id="Example">Example</h2> <pre class="brush: js">var c = document.images; // This is an HTMLCollection var img0 = c.item(0); // You can use the item( ) method this way var img1 = c[1]; // But this notation is easier and more common </pre> <h2 id="See_also">See also</h2> <ul> <li>{{domxref("NodeList.item()")}}</li> </ul>