---
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>