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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>
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