// 检测字体
var isSupportFontFamily = function (f) {
    if (typeof f != "string") {
        return false
    }
    var h = "Arial";
    if (f.toLowerCase() == h.toLowerCase()) {
        return true
    }
    var e = "a";
    var d = 100;
    var a = 100,
        i = 100;
    var c = document.createElement("canvas");
    var b = c.getContext("2d");
    c.width = a;
    c.height = i;
    b.textAlign = "center";
    b.fillStyle = "black";
    b.textBaseline = "middle";
    var g = function (j) {
        b.clearRect(0, 0, a, i);
        b.font = d + "px " + j + ", " + h;
        b.fillText(e, a / 2, i / 2);
        var k = b.getImageData(0, 0, a, i).data;
        return [].slice.call(k).filter(function (l) {
            return l != 0
        })
    };
    return g(h).join("") !== g(f).join("")
};

// 获取ie版本
function getIeVersion() {
    var ie = navigator.userAgent.indexOf('Trident') == -1 ? false : true;
    var version = navigator.appVersion;
    var versionName = '';
    if (ie && version) {
        if (version.indexOf('rv:11.0') != -1) {
            return versionName = 'ie11'
        } else if (version.indexOf('MSIE 10.0') != -1) {
            return versionName = 'ie10'
        } else if (version.indexOf('MSIE 9.0') != -1) {
            return versionName = 'ie9'
        } else if (version.indexOf('MSIE 8.0') != -1) {
            return versionName = 'ie8'
        } else if (version.indexOf('MSIE 7.0') != -1) {
            return versionName = 'ie7'
        }
    }
    return -1;
}

let ieVer = getIeVersion();

if (ieVer !== -1) {
    document.body.className = 'ie';
    document.body.id = 'ieb';
    let link = document.createElement('link');
    link.rel = 'stylesheet';
    link.href = 'styles/ie.css';
    document.head.appendChild(link);
}