從sessionStorage服務需要很長時間

我有一個函數，應該從sessionStorage返回一個字典，如果它存在，如果不存在，它將從API加載字典到sessionStorage，然後返回字典。從sessionStorage服務需要很長時間

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; 
    };

我想緩存字典，因爲它可能非常大（約0.5MB JSON）。

樣品詞典：

{"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}]}]}

的問題是，從高速緩存服務的字典是沒有幫助。從sessionStorage服務字典所用的時間幾乎與從遠程API加載字典所需的時間一樣長。

爲什麼從sessionStorage返回這麼久？

來源

2017-04-13 joshua miller

爲什麼在調用'JSON.parse（）'之前不檢查'sessionStorage'中是否定義了key？ – guest271314

我想我可以，但我不認爲這會有很大的不同。據我所知，在空值上調用JSON.parse（）是可忽略的 –

很長時間？花費的時間有什麼問題？ – charlietfl

調試後，似乎問題不是sessionStorage。

問題是AngularJS需要一個年齡來呈現1000多個元素的ng-repeat。這是我將不得不考慮的下一件事

來源

2017-04-18 08:43:19

從sessionStorage服務需要很長時間

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