改变this作用域

1

通过var me =this;

Ext.define('assign.BaseViewport', {
    extend : 'Ext.Viewport',    
    initComponent : function() {
        var me =this;
        Ext.get('xjfq_back1').on('click',function(){
            me.cardBack();
            //直接调用this.cardBack访问不到对应的方法
        });
    cardBack:function() {
        this.cardLayout.layout.setActiveItem(0);
        return;
       }
});

Done