检测ie版本

function CheckVersion() {
    //var ie = /msie/.test(navigator.userAgent.toLowerCase());
    //var ie6 = /msie\s6/.test(navigator.userAgent.toLowerCase());
    //var ie7 = /msie\s7/.test(navigator.userAgent.toLowerCase());
    //var ie8 = /msie\s8/.test(navigator.userAgent.toLowerCase());
    //if (ie6 || ie7 || ie8) {
    //    $.scojs_message('不支持ie 678请换支持html5浏览器', $.scojs_message.TYPE_OK);
    //}
    var _IE = (function () {
        var v = 3, div = document.createElement('div'), all = div.getElementsByTagName('i');
        while (
            div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
            all[0]
        );
        return v > 4 ? v : false;
    }());
    if (_IE && _IE <= 8) {
        $.scojs_message('不支持ie678，请使用其他浏览器', $.scojs_message.TYPE_OK);
    }
}