$("#addfav").click(function() {   var ua = navigator.userAgent.toLowerCase(),    url =location.href,    sitename =document.title;   if(ua.indexOf("msie 8")>-1){      external.AddToFavoritesBar(url,sitename,"");//IE8  }else{    try{      window.external.addFavorite(url,sitename);    }catch(e){      try{      window.sidebar.addPanel(sitename,url,"");//firefox      }catch(e){      alert("加入收藏失败，请使用Ctrl+D进行添加");      }    }  }  return false;});function SetHome(obj,vrl){       try{           obj.style.behavior=‘url(#default#homepage)‘;obj.setHomePage(vrl);           }           catch(e){           if(window.netscape) {           try {           netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");           }           catch (e) {           alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为‘true‘,双击即可。");           }           var prefs = Components.classes[‘@mozilla.org/preferences-service;1‘].getService(Components.interfaces.nsIPrefBranch);           prefs.setCharPref(‘browser.startup.homepage‘,vrl);           }else{           alert("设为主页失败，该浏览器不支持自动设为主页功能。请手动添加");           }       } }

<span onclick="SetHome(this,window.location)" target="_self">设为首页</span><span id="addfav">加入收藏</span>