js怎么判断ie11浏览器

function isIE11() {
    return !!navigator.userAgent.match(/Trident\/7\./);
}

if (isIE11()) {
    console.log('This is IE11');
} else {
    console.log('This is not IE11');
}

function isIE11() {
    return !!navigator.userAgent.match(/Trident\/7\./) && !document.documentMode;
}

if (isIE11()) {
    console.log('This is IE11');
} else {
    console.log('This is not IE11');
}

function isIE11() {
    return !!window.MSInputMethodContext && !!document.documentMode;
}

if (isIE11()) {
    console.log('This is IE11');
} else {
    console.log('This is not IE11');
}

function isIE11() {
    return !!(window.MSInputMethodContext && document.documentMode);
}

if (isIE11()) {
    console.log('This is IE11');
} else {
    console.log('This is not IE11');
}