添加css样式：

bodyStyle :'overflow-x:hidden;overflow-y:scroll'

完整如下：

var cons_panel = new Ext.Panel({
        title : '操作',
        height: 15000,
        layout : 'anchor',
        bodyStyle :'overflow-x:hidden;overflow-y:scroll',
        border : false,
        closable: true
        .....
}