js判断浏览器是电脑，iPad还是手机

var os = function (){
    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) {
    // 手机
    
} else if (os.isTablet) {
    // 平板
   
} else if (os.isPc) {
    // pc
    
}

https://blog.csdn.net/qq_36509946/article/details/93501194?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2_{aggregatepage}first_rank_ecpm_v1~rank_v31_ecpm-1-93501194.pc_agg_new_rank&utm_term=%E5%88%A4%E6%96%AD%E6%98%AF%E6%89%8B%E6%9C%BA%E8%BF%98%E6%98%AFipad&spm=1000.2123.3001.4430