量角器元素的延遲執行ArrayrayFinder.map

Question

如果您調用量角器elementArrayFinder的map函數，它將立即搜索DOM以查找要映射它們的元素，這與$$的行爲不同，後者一直等到需要子元素ArrayArrayFinder評估找到原始元素及其後代。

我需要延遲映射函數執行的原因是我想爲了抽象的目的在我的測試文件之外的文件中預先定義它。目前的嘗試我是：

Question.array = function(elementArrayFinder) { 

    function delayedPromise(executor) { 
    this.executor = executor; 
    } 

    delayedPromise.prototype.then = function(onFulfilled, onRejected) { 
    console.log('locating elements'); 
    return (new Promise(this.executor)).then(onFulfilled, onRejected); 
    }; 

    return new delayedPromise(function(resolve, reject) { 
    elementArrayFinder.map(function(omniTask) { 
     return new Question(omniTask); 
    }).then(resolve, reject); 
    }); 
}; 

這是工作了一段時間，但是當我重新調整了測試文件今日（不包含此功能的文件，這個功能有一段時間沒有改變），JavaScript的開始有關於這個功能的存儲問題：

<--- Last few GCs ---> 

    133580 ms: Mark-sweep 1354.3 (1421.2) -> 1354.3 (1437.2) MB, 2608.1/0.0 ms [allocation failure] [GC in old space requested]. 
    136052 ms: Mark-sweep 1354.3 (1437.2) -> 1354.3 (1437.2) MB, 2471.9/0.0 ms [allocation failure] [GC in old space requested]. 
    138829 ms: Mark-sweep 1354.3 (1437.2) -> 1355.7 (1421.2) MB, 2775.8/0.0 ms [last resort gc]. 
    141436 ms: Mark-sweep 1355.7 (1421.2) -> 1357.0 (1421.2) MB, 2606.6/0.0 ms [last resort gc]. 


<--- JS stacktrace ---> 

==== JS stack trace ========================================= 

Security context: 0x13c845cfb51 <JS Object> 
    1: enqueue [/Users/thasisclaus/omnistack/node_modules/selenium-webdriver/lib/promise.js:~2742] [pc=0x27de9185871b] (this=0x2b9531847931 <an EventEmitter with map 0x17526dabf9e9>,task=0x17b6b944f181 <a Deferred with map 0x17526dac0649>) 
    2: addCallback_ [/Users/thasisclaus/omnistack/node_modules/selenium-webdriver/lib/promise.js:~1328] [pc=0x27de919c1a75] (this=0x17b6b944eeb9 <a ManagedPro... 

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory 
1: node::Abort() [/usr/local/bin/node] 
2: node::FatalException(v8::Isolate*, v8::Local<v8::Value>, v8::Local<v8::Message>) [/usr/local/bin/node] 
3: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [/usr/local/bin/node] 
4: v8::internal::Factory::NewFixedArray(int, v8::internal::PretenureFlag) [/usr/local/bin/node] 
5: v8::internal::Handle<v8::internal::TypeFeedbackMetadata> v8::internal::TypeFeedbackMetadata::New<v8::internal::FeedbackVectorSpec>(v8::internal::Isolate*, v8::internal::FeedbackVectorSpec const*) [/usr/local/bin/node] 
6: v8::internal::(anonymous namespace)::EnsureFeedbackVector(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
7: v8::internal::(anonymous namespace)::GenerateBaselineCode(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
8: v8::internal::(anonymous namespace)::GetUnoptimizedCodeCommon(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
9: v8::internal::Compiler::Compile(v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Compiler::ClearExceptionFlag) [/usr/local/bin/node] 
10: v8::internal::Accessors::FunctionLengthGetter(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&) [/usr/local/bin/node] 
11: v8::internal::PropertyCallbackArguments::Call(void (*)(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&), v8::internal::Handle<v8::internal::Name>) [/usr/local/bin/node] 
12: v8::internal::Object::GetPropertyWithAccessor(v8::internal::LookupIterator*) [/usr/local/bin/node] 
13: v8::internal::Object::GetProperty(v8::internal::LookupIterator*) [/usr/local/bin/node] 
14: v8::internal::Builtin_Impl_FunctionPrototypeBind(v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)0>, v8::internal::Isolate*) [/usr/local/bin/node] 
15: v8::internal::Builtin_FunctionPrototypeBind(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/local/bin/node] 
16: 0x27de909092a7 
17: 0x27de9185871b 
18: 0x27de919c1a75 
19: 0x27de919c202c 
20: 0x27de912d1b27 
21: 0x27de90909895 
22: 0x27de912dee53 
>> FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory 
>> 1: node::Abort() [/usr/local/bin/node] 
>> 2: node::FatalException(v8::Isolate*, v8::Local<v8::Value>, v8::Local<v8::Message>) [/usr/local/bin/node] 
>> 3: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [/usr/local/bin/node] 
>> 4: v8::internal::Factory::NewFixedArray(int, v8::internal::PretenureFlag) [/usr/local/bin/node] 
>> 5: v8::internal::Handle<v8::internal::TypeFeedbackMetadata> v8::internal::TypeFeedbackMetadata::New<v8::internal::FeedbackVectorSpec>(v8::internal::Isolate*, v8::internal::FeedbackVectorSpec const*) [/usr/local/bin/node] 
>> 6: v8::internal::(anonymous namespace)::EnsureFeedbackVector(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
>> 7: v8::internal::(anonymous namespace)::GenerateBaselineCode(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
>> 8: v8::internal::(anonymous namespace)::GetUnoptimizedCodeCommon(v8::internal::CompilationInfo*) [/usr/local/bin/node] 
>> 9: v8::internal::Compiler::Compile(v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Compiler::ClearExceptionFlag) [/usr/local/bin/node] 
>> 10: v8::internal::Accessors::FunctionLengthGetter(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&) [/usr/local/bin/node] 
>> 11: v8::internal::PropertyCallbackArguments::Call(void (*)(v8::Local<v8::Name>, v8::PropertyCallbackInfo<v8::Value> const&), v8::internal::Handle<v8::internal::Name>) [/usr/local/bin/node] 
>> 12: v8::internal::Object::GetPropertyWithAccessor(v8::internal::LookupIterator*) [/usr/local/bin/node] 
>> 13: v8::internal::Object::GetProperty(v8::internal::LookupIterator*) [/usr/local/bin/node] 
>> 14: v8::internal::Builtin_Impl_FunctionPrototypeBind(v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)0>, v8::internal::Isolate*) [/usr/local/bin/node] 
>> 15: v8::internal::Builtin_FunctionPrototypeBind(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/local/bin/node] 
>> 16: 0x27de909092a7 
>> 17: 0x27de9185871b 
>> 18: 0x27de919c1a75 
>> 19: 0x27de919c202c 
>> 20: 0x27de912d1b27 
>> 21: 0x27de90909895 
>> 22: 0x27de912dee53 

在今天我改變了測試文件的背景是：

fit('Should have the right number of assignment questions initially', function(done) { 
     var done = browserHelper.strictDone(done), 
      self = this; 

     self.communityQuestions = self.myQuestions = []; 

     console.log(self.assignmentQuestions.length, self.communityQuestions.length, self.myQuestions.length) 

     assignmentPage.assignmentQuestions.then(function(assignmentQuestions) { 
     expect(assignmentQuestions.length).toEqual(self.assignmentQuestions.length); 

     assignmentPage.communityQuestionsTab.click(); 

     assignmentPage.communityQuestions.then(function(communityQuestions) { 
      expect(communityQuestions.length).toEqual(self.communityQuestions.length); 

      assignmentPage.myQuestionsTab.click(); 

      assignmentPage.myQuestions.then(function(myQuestions) { 
      console.log(myQuestions); 

      expect(myQuestions.length).toEqual(self.myQuestions.length); 

      done(); 
      }); 
     }); 
     }); 
    }); 

我不知道，如果錯誤實際上是CAU通過函數調用或者函數碰巧遇到的一些外部變化。無論如何，我認爲可能有更好的方式來延遲地圖功能，很可能是直接與量角器的控制流程交互。

Answer 1

即使我不回來了地圖（而不是我是從返回的元素構造的對象），我認爲這是有關這個錯誤在地圖掛元素：https://github.com/angular/protractor/issues/2227

要解決它，我只是將我的map更改爲reduce，並更改了相應傳遞的功能，這些功能完美無缺。

我敢肯定map是不太更新迭代elementArrayFinder功能之一，因爲不像reduce和lodash功能，map沒有最後一個參數是收集，從而如下較舊的約定。