[https://www.runoob.com/jsref/obj-navigator.html](https://www.runoob.com/jsref/obj-navigator.html) [https://developer.mozilla.org/zh-CN/docs/Web/API/Navigator](https://developer.mozilla.org/zh-CN/docs/Web/API/Navigator) 判断浏览器 ``` var ua=navigator.userAgent; if (/firefox/i.test(ua)) { console.log("firefox"); } else if (/chrome/i.test(ua)){ console.log("chrome"); } else if (/msie/i.test(ua)){ console.log("IE"); } else if ("ActiveXObject" in window) { console.log("IE11"); } //注意：edge使用chrome内核啦 ```