判断IE浏览器版本

function IEVer(){

var rv = -1;

if (navigator.appName == 'Microsoft Internet Explorer'){

var ua = navigator.userAgent;

var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");

if (re.exec(ua) != null){

rv = parseFloat( RegExp.$1 );

}

}else if (navigator.appName == 'Netscape'){

var ua = navigator.userAgent;

var re = new RegExp("Trident/.*rv:([0-9]{1,}[\.0-9]{0,})");

if (re.exec(ua) != null){

rv = parseFloat( RegExp.$1 );

}

}

return rv;

}

var IEVer = IEVer();

// 若是11 则返回11 ，若是其他版本则返回-1

// edge判断

var userAgent = navigator.userAgent;

var isEdge = userAgent.indexOf("Edge")>-1;