原生js编写设为首页兼容ie、火狐和谷歌

// JavaScript Document
// 加入收藏 <a onclick="AddFavorite(window.location,document.title)">加入收藏</a>
function AddFavorite(sURL, sTitle) {
    try {
        window.external.addFavorite(sURL, sTitle);
    } catch (e) {
        try {
            window.sidebar.addPanel(sTitle, sURL, "");
        } catch (e) {
            alert("加入收藏失败，请使用Ctrl+D进行添加");
        }
    }
}
//设为首页 <a onclick="SetHome(this,window.location)" >设为首页</a>
function SetHome(obj, vrl) {
    //debugger;
    //谷歌下vrl为数组对象非字符串
    var homePage='wwww.baidu.com';
    try {
        obj.style.behavior = 'url(#default#homepage)';
        obj.setHomePage(homePage);
    } 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', homePage);
        }
    }
}