Window navigator.userAgent Property

Definition and Usage

userAgent The property returns the user-agent header sent by the browser to the server.

userAgent The property is read-only.

The returned value contains information about the browser name, version, and platform.

The Web规范建议浏览器应提供尽可能少的标头信息。永远不要假设这个属性在未来的浏览器中会保持不变。

Instance

Example 1

Get navigator.userAgent:

let agent = navigator.userAgent;

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Example 2

Display all navigator properties:

let text = "<p>Browser CodeName: " + navigator.appCodeName + "</p>" +
"<p>Browser Name: " + navigator.appName + "</p>" +
"<p>Browser Version: " + navigator.appVersion + "</p>" +
"<p>Cookies Enabled: " + navigator.cookieEnabled + "</p>" +
"<p>Browser Language: " + navigator.language + "</p>" +
"<p>Browser Online: " + navigator.onLine + "</p>" +
"<p>Platform: " + navigator.platform + "</p>" +
"<p>User-agent header: " + navigator.userAgent + "</p>";

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Syntax

navigator.userAgent

Return Value

Type Description
String Browser User-Agent Header.

Browser Support

All Browsers Support navigator.userAgent:

Chrome IE Edge Firefox Safari Opera
Chrome IE Edge Firefox Safari Opera
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