js查询浏览器版本

function getBrowserInfo() {
    var ua = navigator.userAgent, tem,
    M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
    if (/trident/i.test(M[1])) {
        tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
        return { name: 'IE', version: (tem[1] || '') };
    }
    if (M[1] === 'Chrome') {
        tem = ua.match(/\bOPR|Edge\/(\d+)/)
        if (tem !== null) return { name: 'Opera', version: tem[1] };
    }
    M = M[2] ? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?'];
    tem = ua.match(/version\/(\d+)/i);
    if (tem !== null) M.splice(1, 1, tem[1]);
    return { name: M[0], version: M[1] };
}

var browser = getBrowserInfo();
console.log(browser.name + " " + browser.version);