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Diffstat (limited to 'files/zh-cn/web/api/element/hasattribute')
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diff --git a/files/zh-cn/web/api/element/hasattribute/index.html b/files/zh-cn/web/api/element/hasattribute/index.html new file mode 100644 index 0000000000..7d5a72f87c --- /dev/null +++ b/files/zh-cn/web/api/element/hasattribute/index.html @@ -0,0 +1,31 @@ +--- +title: Element.hasAttribute() +slug: Web/API/Element/hasAttribute +translation_of: Web/API/Element/hasAttribute +--- +<div> + {{APIRef}}</div> +<h2 id="Summary" name="Summary">概述</h2> +<p><code>hasAttribute</code> 返回一个布尔值，指示该元素是否包含有指定的属性（attribute）。</p> +<h2 id="Syntax" name="Syntax">语法</h2> +<pre class="syntaxbox"><var>var result</var> = <var>element</var>.hasAttribute(<var>attName</var>); +</pre> +<ul> + <li><code>result</code> 为返回的布尔值：<code>true</code> 或 <code>false</code>。</li> + <li><code>attName</code> 是一个字符串，表示属性的名称。</li> +</ul> +<h2 id="Example" name="Example">例子</h2> +<pre class="brush:js">// 在为属性设置新值前检测该属性是否存在 +var d = document.getElementById("div1"); + +if (d.hasAttribute("align")) { + d.setAttribute("align", "center"); +}</pre> +<h2 id="Notes" name="Notes">备注</h2> +<div> + {{DOMAttributeMethods}}</div> +<h2 id="Specification" name="Specification">规范</h2> +<ul> + <li><a href="http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-ElHasAttr">DOM Level 2 Core: hasAttribute</a></li> + <li><a href="http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-ElHasAttr">DOM Level 3 Core: hasAttribute</a></li> +</ul> |