JavaScript判断浏览器的类型

JavaScript判断浏览器的类型

var request = false;
var btype=getinternet();  
function getinternet()    
{    
if(navigator.useragent.indexof("msie")>0) {    
              return "msie";       //ie浏览器  
}  
if(isfirefox=navigator.useragent.indexof("firefox")>0){    
              return "firefox";     //firefox浏览器  
}  
if(issafari=navigator.useragent.indexof("safari")>0) {    
              return "safari";      //safan浏览器  
}  
if(iscamino=navigator.useragent.indexof("camino")>0){    
              return "camino";   //camino浏览器  
}  
if(ismozilla=navigator.useragent.indexof("gecko/")>0){    
              return "gecko";    //gecko浏览器  
}    
}   
try {
  request = new xmlhttprequest();
} catch (trymicrosoft) {
  try {
    request = new activexobject("msxml2.xmlhttp");//支持microsoft
  } catch (othermicrosoft) {
    try {
      request = new activexobject("microsoft.xmlhttp");//支持非microsoft
    } catch (failed) {
      request = false;  
    }  
}
}