js实现设为首页

function setHomepage(url)
{
    if (document.all){
        document.body.style.behavior='url(#default#homepage)';
        document.body.setHomePage(url);
    } else if (window.sidebar){
        if(window.netscape){
            try{
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
            }catch (e){
                alert( "该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true" );
            }
        }
        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components. interfaces.nsIPrefBranch);
        prefs.setCharPref('browser.startup.homepage',url);
    }
}

<A href="javascript:setHomepage('http://www.ilaopo.net')">设为首页</a>