javascript设置首页与加入收藏(实例)

//设置首页
function setHomePage(obj) {
var aUrls = document.URL.split("/");
var vDomainName = "http://" + aUrls[2] + "/";
try {//IE
 obj.style.behavior = "url(#default#homepage)";
 obj.setHomePage(vDomainName);
  } catch (e) {//other
 if (window.netscape) {//Firefox
     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]设置为'true'");
     }
     var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
     prefs.setCharPref('browser.startup.homepage', vDomainName);
 }
  }
  if (window.netscape) alert("设置首页成功！");
  return false; //阻止a标签继续执行
   }
   //加入收藏函数
   function addFavorite(obj) {
  var aUrls = document.URL.split("/");
  var vDomainName = "http://" + aUrls[2] + "/";
  var description = obj.title;
  try {//IE
 window.external.AddFavorite(vDomainName, description);
  } catch (e) {//Firefox
 window.sidebar.addPanel(description, vDomainName, "");
  }
  return false; //阻止a标签继续执行
   }

function funBackTop() {
  var elem = $('.backtop'), h = window.screen.height, time = null, srctop = 0;
  this.init = function () {
 elem.bind('click', function () {
     $('#container').scrollTop(0);
 })

 time = setInterval(function () {
     srctop = $('#container').scrollTop();
     if (srctop > h) {
    elem.show();
     }
     else {
    elem.hide();
     }
 }, 500)
  }
}