---
title: Window.navigator
slug: Web/API/Window/navigator
translation_of: Web/API/Window/navigator
---
<div>{{APIRef}}</div>

<p>The <code>Window.navigator</code> read-only property returns a reference to the {{domxref("Navigator")}} object, which can be queried for information about the application running the script.</p>

<h2 id="Example" name="Example">語法</h2>

<pre class="syntaxbox"><em>navigatorObject<code> = window.navigator</code></em></pre>

<h2 id="Specification" name="Specification">範例</h2>

<h3 id="Example_1_Browser_detect_and_return_a_string">Example #1: Browser detect and return a string</h3>

<pre class="brush: js">var sBrowser, sUsrAg = navigator.userAgent;

if(sUsrAg.indexOf("Chrome") &gt; -1) {
    sBrowser = "Google Chrome";
} else if (sUsrAg.indexOf("Safari") &gt; -1) {
    sBrowser = "Apple Safari";
} else if (sUsrAg.indexOf("Opera") &gt; -1) {
    sBrowser = "Opera";
} else if (sUsrAg.indexOf("Firefox") &gt; -1) {
    sBrowser = "Mozilla Firefox";
} else if (sUsrAg.indexOf("MSIE") &gt; -1) {
    sBrowser = "Microsoft Internet Explorer";
}

alert("You are using: " + sBrowser);</pre>

<h3 id="Example_2_Browser_detect_and_return_an_index">Example #2: Browser detect and return an index</h3>

<pre class="brush: js">function getBrowserId () {

    var
        aKeys = ["MSIE", "Firefox", "Safari", "Chrome", "Opera"],
        sUsrAg = navigator.userAgent, nIdx = aKeys.length - 1;

    for (nIdx; nIdx &gt; -1 &amp;&amp; sUsrAg.indexOf(aKeys[nIdx]) === -1; nIdx--);

    return nIdx

}

console.log(getBrowserId());</pre>

<h2 id="Specification" name="Specification">規範</h2>

<ul>
 <li>{{SpecName("HTML5 W3C", "webappapis.html#the-navigator-object","window.navigator")}}</li>
 <li>{{SpecName("HTML5.1", "webappapis.html#the-navigator-object", "window.navigator")}}</li>
 <li>{{SpecName("HTML WHATWG", "timers.html#the-navigator-object", "window.navigator")}}</li>
</ul>

<h2 id="See_also" name="See_also">參見</h2>