js判断浏览器类型

<script type=“baitext/javascript”>
function isIE(){
　　return navigator.appName.indexOf(“Microsoft Internet Explorer”)!=-1 && document.all;
}
function isIE6() {
　　return navigator.userAgent.split(“;”)[1].toLowerCase().indexOf(“msie 6.0″du)==“-1″?false:true;
}
function isIE7(){
　　return navigator.userAgent.split(“;”)[1].toLowerCase().indexOf(“msie 7.0″)==“-1″?false:true;
}
function isIE8(){
　　return navigator.userAgent.split(“;”)[1].toLowerCase().indexOf(“msie 8.0″)==“-1″?false:true;
}
function isNN(){
　　return navigator.userAgent.indexOf(“Netscape”)!=-1;
}
function isOpera(){
　　return navigator.appName.indexOf(“Opera”)!=-1;
}
function isFF(){
　　return navigator.userAgent.indexOf(“Firefox”)!=-1;
}
function isChrome(){
　　return navigator.userAgent.indexOf(“Chrome”) > -1;
}
</script>