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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/api/document/hasfocus/index.html | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/api/document/hasfocus/index.html b/files/zh-cn/web/api/document/hasfocus/index.html new file mode 100644 index 0000000000..e7386bd4d1 --- /dev/null +++ b/files/zh-cn/web/api/document/hasfocus/index.html @@ -0,0 +1,122 @@ +--- +title: document.hasFocus +slug: Web/API/Document/hasFocus +tags: + - API + - DOM + - 参考 + - 方法 + - 焦点 +translation_of: Web/API/Document/hasFocus +--- +<p>{{ ApiRef }}</p> + +<h3 id="Summary" name="Summary">概述</h3> + +<p><code><strong>Document.hasFocus()</strong></code> 方法返回一个 {{jsxref("Boolean")}},表明当前文档或者当前文档内的节点是否获得了焦点。该方法可以用来判断当前文档中的活动元素是否获得了焦点。</p> + +<div class="note">当查看一个文档时,当前文档中获得焦点的元素一定是当前文档的活动元素,但一个文档中的活动元素不一定获得了焦点.。例如, 一个在后台的窗口中的活动元素一定没有获得焦点。</div> + +<h3 id="Syntax" name="Syntax">语法</h3> + +<pre class="eval">focused = document.hasFocus(); +</pre> + +<h4 id="返回值">返回值</h4> + +<p>如果当前文档的活动元素获得了焦点,返回<code> true</code>,否则返回false。</p> + +<h3 id="Example" name="Example">例子</h3> + +<pre class="brush: js"><!DOCTYPE html> +<html> +<head> + <style type='text/css'> + #message { font-weight: bold; } + </style> + +<script type='text/javascript'> + setInterval("CheckPageFocus()", 200); + + function CheckPageFocus() { + var info = document.getElementById("message"); + if (document.hasFocus()) { + info.innerHTML = "该页面获得了焦点."; + } + else { + info.innerHTML = "该页面没有获得焦点."; + } + } + + function OpenWindow() { + window.open ("<a href="http://developer.mozilla.org/">http://developer.mozilla.org/</a>", "mozdev", + "width=640, height=300, left=150, top=260"); + } +</script> +</head> + +<body> + document.hasFocus 演示<br /><br /> +<div id="message">等待用户操作</div><br /> +<button onclick="OpenWindow()">打开一个新窗口</button> +</body> +</html> +</pre> + +<h3 id="浏览器兼容性"><span>浏览器兼容性</span></h3> + +<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>{{ CompatGeckoDesktop("1.9") }}</td> + <td>6.0</td> + <td>{{ CompatNo() }}</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>Firefox Mobile (Gecko)</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{ CompatUnknown() }}</td> + <td>{{ CompatGeckoMobile("1.9") }}</td> + <td>{{ CompatUnknown() }}</td> + <td>{{ CompatNo() }}</td> + <td>{{ CompatUnknown() }}</td> + </tr> + </tbody> +</table> +</div> + +<h3 id="Specification" name="Specification">规范</h3> + +<ul> + <li><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/#focus-management">Focus management </a></li> +</ul> + +<p>{{ languages( { "en": "en/DOM/document.hasFocus","es": "es/DOM/element.hasFocus", "fr": "fr/DOM/document.hasFocus", "ja": "ja/DOM/document.hasFocus", "pl": "pl/DOM/document.hasFocus" } ) }}</p> |