检测ie11浏览器 js

function detectIE() {
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf('MSIE ');
    var trident = ua.indexOf('Trident/');
    var edge = ua.indexOf('Edge/');

    if (msie > 0 || trident > 0 || edge > 0) {
        // IE 10 or older => return version number
        var version = parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
        if (isNaN(version)) {
            version = parseInt(ua.substring(trident + 7, ua.indexOf('.', trident)), 10);
        }
        if (version === 11) {
            console.log('IE11 detected');
            // 在这里添加针对IE11的特殊处理逻辑
        } else {
            console.log('IE ' + version + ' detected');
        }
    } else {
        console.log('Not IE');
    }
}

detectIE();

if ('Promise' in window) {
    console.log('Promise is supported');
} else {
    console.log('Promise is not supported');
}