问题背景
在列表选中APN进入编辑后，退出返回列表界面时无法焦点选中编辑的APN。
代码分析
路径：gaia/apps/settings/js/panels/apn_list/panel.js
分析SettingsPanel界面加载的步骤逻辑
onBeforeShow -> onShow -> onBeforeHide -> onHide
return SettingsPanel({//初始化onInit: function onInit(panel) {rootElement = panel;mainHeader = rootElement.querySelector('gaia-header');header = mainHeader.querySelector('h1');apnListViewRoot = rootElement.querySelector('.apn-list');mainHeader.addEventListener('action', onBackBtnClick);},//界面渲染前onBeforeShow: function onBeforeShow(panel, options) {role = options.role || role;if (options.type) {focusId = 0;}/** When back from apn editor, there is no type and serviceId specified
