JavaScript 获取浏览器的类型和页面编码

function getPageCharset(){    var charSet = "";    var oType = getBrowser();    switch(oType){        case "IE":            charSet = document.charset;            break;        case "FIREFOX":            charSet = document.characterSet;            break;        default:            break;    }    return charSet;}function getBrowser(){    var oType = "";    if(navigator.userAgent.indexOf("MSIE")!=-1){        oType="IE";    }else if(navigator.userAgent.indexOf("Firefox")!=-1){        oType="FIREFOX";    }    return oType;}