navigator.userAgent : 浏览器用于 HTTP 请求的用户代理头的值，通过UserAgent可以取得浏览器类别、版本，客户端操作系统等信息。
在PC端打开 ，navigator.userAgent 显示如下
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36在手机web端打开 ，navigator.userAgent 显示如下
Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title></head><body><div>dianw</div><script>var os = function () {console.log('12')var ua = navigator.userAgent,isWindowsPhone = /(?:Windows Phone)/.test(ua),isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone,isAndroid = /(?:Android)/.test(ua),isFireFox = /(?:Firefox)/.test(ua),isChrome = /(?:Chrome|CriOS)/.test(ua),isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid && !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua)),isPhone = /(?:iPhone)/.test(ua) && !isTablet,isPc = !isPhone && !isAndroid && !isSymbian;return {isTablet: isTablet,isPhone: isPhone,isAndroid: isAndroid,isPc: isPc};}();if (os.isAndroid || os.isPhone) {alert("手机");} else if (os.isTablet) {alert("平板");} else if (os.isPc) {alert("电脑");}</script></body></html>
如果觉得《一段代码识别当前浏览器是pc端 手机端还是平板》对你有帮助，请点赞、收藏，并留下你的观点哦！
