用 JS 判断 浏览器 类型

<script type="text/javascript">
 function getBrowserName() { 
  var browserName = "";
  if(navigator.userAgent.indexOf("MSIE") > 0) {
   browserName = "MSIE";
  }
  if(isFirefox = navigator.userAgent.indexOf("Firefox")>0){
    browserName = "Firefox";
  }
  if(isSafari = navigator.userAgent.indexOf("Safari")>0) {
    browserName = "Safari";
  } 
  if(isCamino = navigator.userAgent.indexOf("Camino")>0){
    browserName = "Camino";
  }
  if(isMozilla = navigator.userAgent.indexOf("Gecko/")>0){
    browserName = "Gecko";
  }
  return browserName;
 }

function test() {
 var browserName = getBrowserName();
 alert("Browser is :: " + browserName);
}
</script>

<input type="button" name="test" value="test" onclick="test()" />