上下文：我實現了一個hero service，在其構造函數里添加了一些打印語句：

在另一個Component的構造函數里將其注入：

運行時，觀察service構造函數如何被調用的：

function getNodeInjectable(lView, tView, index, tNode) {let value = lView[index];const tData = tView.data;if (isFactory(value)) {const factory = value;if (factory.resolving) {throw new Error(`Circular dep for ${stringifyForError(tData[index])}`);}const previousIncludeViewProviders = setIncludeViewProviders(factory.canSeeViewProviders);factory.resolving = true;let previousInjectImplementation;if (factory.injectImpl) {previousInjectImplementation = setInjectImplementation(factory.injectImpl);}enterDI(lView, tNode);try {value = lView[index] = factory.factory(undefined, tData, lView, tNode);// This code path is hit for both directives and providers.// For perf reasons, we want to avoid searching for hooks on providers.// It does no harm to try (the hooks just won't exist), but the extra// checks are unnecessary and this is a hot path. So we check to see// if the index of the dependency is in the directive range for this// tNode. If it's not, we know it's a provider and skip hook registration.if (tView.firstCreatePass && index >= tNode.directiveStart) {ngDevMode && assertDirectiveDef(tData[index]);registerPreOrderHooks(index, tData[index], tView);}}finally {if (factory.injectImpl)setInjectImplementation(previousInjectImplementation);setIncludeViewProviders(previousIncludeViewProviders);factory.resolving = false;leaveDI();}}return value; }

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