js如何判断是ie浏览器

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

    // IE 10 or older => return version number
    if (msie > 0) {
        // IE 10 or older
        return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
    }

    // IE 11 => return version number
    if (trident > 0) {
        // IE 11
        var rv = ua.indexOf('rv:');
        return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
    }

    // Other browser
    return false;
}

if (isIE()) {
    console.log('这是IE浏览器');
} else {
    console.log('这不是IE浏览器');
}