怎样获取页面间传递的参数Ext2.0

创建了一个tab面板，里面包含两个tab页，怎么在tab1.html中获取传递过来的参数值（extjs语句）?
var tabpanel = new Ext.TabPanel({
        renderTo: 'tabs',
        activeTab: 0,
        width:1210,
        height:630,
        plain:true,
        defaults:{autoScroll: true},
        items:[{
                title: 'tab1',
                autoLoad:{url: 'tab1.html',method:'GET',params: 'params1=user1¶ms2=user2',scripts:true}
            },{
                title: 'tab2',
                autoLoad:{url: 'tab2.html',scripts:true}
            }
           ] );
});