判断浏览器环境

function getSystem(){
    const mac = /mac/i,
        linux = /linux/i,
        win = /win/i;
    const platform = navigator.platform.toLowerCase();
    if(mac.test(platform)){
        return 'MAC';
    } else if(win.test(platform)){
        return 'WIN';
    } else if(linux.test(platform)){
        return 'Linux';
    }
    return undefined;
}
const browser = { 
    versions:function(){ 
        let ret = 'xxSys';
        const u = navigator.userAgent;
        const isMobile = !!u.match(/AppleWebKit.*Mobile.*/),
            ios = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/),
            android = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1;
        if(isMobile){
            if(ios) return 'IOS';
            if(android) return 'Android';
        } else {
            ret = getSystem() || ret;
        }
        return ret;
    }(),
};
export default browser;

使用

import browser from "../util/browers.js"
console.log(browser.versions);

加入收藏夹

function addFavorite(sURL, sTitle) {
  try {
    window.external.addFavorite(sURL, sTitle);
  } catch (e) {
    try {
      window.sidebar.addPanel(sTitle, sURL, "");
    } catch (e) {
      alert("加入收藏失败，请使用Ctrl+D进行添加");
    }
  }
}