jquery判定浏览器

<mce:script type="text/javascript"><!--$(function() {if($.browser.msie) {$( function() { alert("this is msie"); });}else if($.browser.safari){$( function() { alert("this is safari!"); });}else if($.browser.mozilla){$( function() { alert("this is mozilla!"); });}else if($.browser.opera){$( function() { alert("this is opera"); });}else{$( function() { alert("i don't konw!"); });}});// --></mce:script>