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+---
+title: BeforeInstallPromptEvent.prompt()
+slug: Web/API/BeforeInstallPromptEvent/prompt
+tags:
+  - BeforeInstallPromptEvent
+  - BeforeInstallPromptEvent.prompt()
+translation_of: Web/API/BeforeInstallPromptEvent/prompt
+---
+<p>{{APIRef("")}}</p>
+
+<p>{{SeeCompatTable}}</p>
+
+<p>{{domxref("BeforeInstallPromptEvent")}} 接口的 <strong><code>prompt()</code></strong>方法允许一个开发人员在自己选择的一个时间显示安装提示。</p>
+
+<h2 id="句法">句法</h2>
+
+<pre class="syntaxbox">BeforeInstallPromptEvent.prompt()</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>无</p>
+
+<h3 id="返回">返回</h3>
+
+<p>一个空的 {{jsxref("Promise")}}.</p>
+
+<h2 id="范例">范例</h2>
+
+<pre>let isTooSoon = true;
+window.addEventListener("beforeinstallprompt", function(e) {
+  if (isTooSoon) {
+    e.preventDefault(); // Prevents prompt display
+    // Prompt later instead:
+    setTimeout(function() {
+      isTooSoon = false;
+      e.prompt(); // Throws if called more than once or default not prevented
+    }, 10000);
+  }
+
+  // The event was re-dispatched in response to our request
+  // ...
+});</pre>
+
+<h2 id="规范">规范</h2>
+
+<article id="wikiArticle">
+<p>This method is not part of a specification.</p>
+</article>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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 (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(45.0)}} [1]</td>
+   <td> </td>
+   <td> </td>
+   <td> </td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Android Webview</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(45.0)}} [1]</td>
+   <td> </td>
+   <td> </td>
+   <td> </td>
+   <td> </td>
+   <td> </td>
+   <td>{{CompatChrome(45.0)}} [1]</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Behind the flag: chrome://flags/#bypass-app-banner-engagement-checks</p>