从sessionStorage服务需要很长时间

我有一个函数，应该从sessionStorage返回一个字典，如果它存在，如果不存在，它将从API加载字典到sessionStorage，然后返回字典。从sessionStorage服务需要很长时间

self.getDictionary = function(dictionary){ 
     var deferred = $q.defer(); 
     var saved_dictionary = JSON.parse($window.sessionStorage.getItem('dictionary_' + dictionary)); 

     if (saved_dictionary && saved_dictionary !== "null"){ 
      deferred.resolve(saved_dictionary); 
     } else { 
      var apiData = {module: "Dictionaries", method: "getDictionary", data: {name: dictionary}}; 
      apiService.execute(apiData).then(function (response) { 
       $window.sessionStorage.setItem('dictionary_' + dictionary, JSON.stringify(response)); 
       deferred.resolve(response); 
      }); 
     } 
     return deferred.promise; 
    };

我想缓存字典，因为它可能非常大（约0.5MB JSON）。

样品词典：

{"DictionaryName":"Gaming","DictionaryCategory":[{"CategoryName":"Games","MandatoryAtLeast":1,"CategoryWords":[{"title":"zelda","score":1,"exact":true,"mandatory":false,"reject":false},{"title":"mass effect","score":1,"exact":false,"mandatory":true,"reject":false},{"title":"pokemon","score":1,"exact":false,"mandatory":true,"reject":false},{"title":"fallout","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"cs:go","score":1,"exact":true,"mandatory":false,"reject":false},{"title":"sims","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"until dawn","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"deus ex","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"skyrim","score":1,"exact":false,"mandatory":true,"reject":false}]},{"CategoryName":"Companies","MandatoryAtLeast":1,"CategoryWords":[{"title":"bioware","score":1,"exact":false,"mandatory":true,"reject":false},{"title":"bethesda","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"steam","score":1,"exact":false,"mandatory":true,"reject":false},{"title":"valve","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"alienware","score":1,"exact":false,"mandatory":false,"reject":false}]},{"CategoryName":"other","MandatoryAtLeast":1,"CategoryWords":[{"title":"gamer","score":1,"exact":false,"mandatory":true,"reject":false},{"title":"mods","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"horror","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"survival","score":1,"exact":true,"mandatory":false,"reject":false},{"title":"multiplayer","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"action","score":1,"exact":true,"mandatory":true,"reject":false},{"title":"fps","score":1,"exact":false,"mandatory":true,"reject":false},{"title":"shooter","score":1,"exact":false,"mandatory":false,"reject":false},{"title":"mmo","score":1,"exact":false,"mandatory":true,"reject":false}]}]}

的问题是，从高速缓存服务的字典是没有帮助。从sessionStorage服务字典所用的时间几乎与从远程API加载字典所需的时间一样长。

为什么从sessionStorage返回这么久？

来源

2017-04-13 joshua miller

为什么在调用'JSON.parse（）'之前不检查'sessionStorage'中是否定义了key？ – guest271314

我想我可以，但我不认为这会有很大的不同。据我所知，在空值上调用JSON.parse（）是可忽略的 –

很长时间？花费的时间有什么问题？ – charlietfl

调试后，似乎问题不是sessionStorage。

问题是AngularJS需要一个年龄来呈现1000多个元素的ng-repeat。这是我将不得不考虑的下一件事

来源

2017-04-18 08:43:19

从sessionStorage服务需要很长时间

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