/* 页面数据缓存 */
var _CACHE_OBJS = {};
 
function _init_cache(comp, key, cache) {
 var obj = cache[key];
 if (obj !== undefined) {
 comp[key] = obj;
 }
 var deep = typeof comp[key] === 'object';
 comp.$watch(key,
 function (val) {
  //console.log("page " + key + " updated");
  cache[key] = val;
 }, {
  deep: deep
 });
}
 
 
var _PAGE_CACHE = {
 /*
 * 初始化页面缓存数据
 * comp: 当前页面component 对象
 * path: 当前页面vue router path
 * data: 需要缓存的数据对象名称，或名称数组
 */
 cache: function (comp, path, data) {
 if (data == '' || data == undefined || data == null) {
  data = restore(comp._data);
 }
 var cache = _CACHE_OBJS[path];
 if (cache === undefined) {
  cache = {};
  _CACHE_OBJS[path] = cache;
 }
 if (typeof data == 'string') {
  _init_cache(comp, data, cache);
 } else {
  var i;
  for (i = 0; i < data.length; ++i) {
  _init_cache(comp, data[i], cache);
  }
 }
 console.log(_CACHE_OBJS, "页面数据缓存");
 },
 
 /* 清除页面缓存 */
 clear: function (path) {
 delete _CACHE_OBJS[path];
 },
 
 /* 清空所有缓存数据 */
 reset: function () {
 //console.log("reset page cache");
 _CACHE_OBJS = {};
 },
 /*根据path查看当前页面缓存是否存在*/
 has_cache: function (path) {
 return _CACHE_OBJS[path] !== undefined && !isEmptyObject(_CACHE_OBJS[path]);
 }
};
 
Vue.prototype.$cache = _PAGE_CACHE;
/* eslint-disable no-new */
 
var restore = function (vueObject) {
 var result = [];
 for (var index in vueObject) {
 result.push(index);
 }
 return result;
};
 
var isEmptyObject = function (obj) {
 for (var key in obj) {
 return false;
 }
 return true;
}