Angular应用bootstrap时的version检测机制

core.js里：

 create(injector, projectableNodes, rootSelectorOrNode, ngModule) {ngModule = ngModule || this.ngModule;/** @type {?} */const rootViewInjector = ngModule ? createChainedInjector(injector, ngModule.injector) : injector;/** @type {?} */const rendererFactory = (/** @type {?} */ (rootViewInjector.get(RendererFactory2, domRendererFactory3)));/** @type {?} */const sanitizer = rootViewInjector.get(Sanitizer, null);/** @type {?} */const hostRenderer = rendererFactory.createRenderer(null, this.componentDef);// Determine a tag name used for creating host elements when this component is created// dynamically. Default to 'div' if this component did not specify any tag name in its selector./** @type {?} */const elementName = (/** @type {?} */ (this.componentDef.selectors[0][0])) || 'div';/** @type {?} */const hostRNode = rootSelectorOrNode ?locateHostElement(hostRenderer, rootSelectorOrNode, this.componentDef.encapsulation) :elementCreate(elementName, rendererFactory.createRenderer(null, this.componentDef), getNamespace$1(elementName));/** @type {?} */const rootFlags = this.componentDef.onPush ? 64 /* Dirty */ | 512 /* IsRoot */ :16 /* CheckAlways */ | 512 /* IsRoot */;// Check whether this Component needs to be isolated from other components, i.e. whether it// should be placed into its own (empty) root context or existing root context should be used.// Note: this is internal-only convention and might change in the future, so it should not be// relied upon externally./** @type {?} */const isIsolated = typeof rootSelectorOrNode === 'string' &&/^#root-ng-internal-isolated-\d+/.test(rootSelectorOrNode);/** @type {?} */const rootContext = createRootContext();// Create the root view. Uses empty TView and ContentTemplate./** @type {?} */const rootTView = createTView(0 /* Root */, -1, null, 1, 0, null, null, null, null, null);/** @type {?} */const rootLView = createLView(null, rootTView, rootContext, rootFlags, null, null, rendererFactory, hostRenderer, sanitizer, rootViewInjector);// rootView is the parent when bootstrapping// TODO(misko): it looks like we are entering view here but we don't really need to as// `renderView` does that. However as the code is written it is needed because// `createRootComponentView` and `createRootComponent` both read global state. Fixing those// issues would allow us to drop this.enterView(rootLView, null);/** @type {?} */let component;/** @type {?} */let tElementNode;try {/** @type {?} */const componentView = createRootComponentView(hostRNode, this.componentDef, rootLView, rendererFactory, hostRenderer);if (hostRNode) {if (rootSelectorOrNode) {setUpAttributes(hostRenderer, hostRNode, ['ng-version', VERSION.full]);}else {// If host element is created as a part of this function call (i.e. `rootSelectorOrNode`// is not defined), also apply attributes and classes extracted from component selector.// Extract attributes and classes from the first selector only to match VE behavior.const { attrs, classes } = extractAttrsAndClassesFromSelector(this.componentDef.selectors[0]);if (attrs) {setUpAttributes(hostRenderer, hostRNode, attrs);}if (classes && classes.length > 0) {writeDirectClass(hostRenderer, hostRNode, classes.join(' '));}}}tElementNode = (/** @type {?} */ (getTNode(rootTView, 0)));if (projectableNodes !== undefined) {/** @type {?} */const projection = tElementNode.projection = [];for (let i = 0; i < this.ngContentSelectors.length; i++) {/** @type {?} */const nodesforSlot = projectableNodes[i];// Projectable nodes can be passed as array of arrays or an array of iterables (ngUpgrade// case). Here we do normalize passed data structure to be an array of arrays to avoid// complex checks down the line.// We also normalize the length of the passed in projectable nodes (to match the number of// <ng-container> slots defined by a component).projection.push(nodesforSlot != null ? Array.from(nodesforSlot) : null);}}// TODO: should LifecycleHooksFeature and other host features be generated by the compiler and// executed here?// Angular 5 reference: https://stackblitz.com/edit/lifecycle-hooks-vcrefcomponent = createRootComponent(componentView, this.componentDef, rootLView, rootContext, [LifecycleHooksFeature]);renderView(rootTView, rootLView, null);}finally {leaveView();}/** @type {?} */const componentRef = new ComponentRef$1(this.componentType, component, createElementRef(ElementRef, tElementNode, rootLView), rootLView, tElementNode);if (!rootSelectorOrNode || isIsolated) {// The host element of the internal or isolated root view is attached to the component's host// view node.ngDevMode && assertNodeOfPossibleTypes(rootTView.node, 2 /* View */);(/** @type {?} */ (rootTView.node)).child = tElementNode;}return componentRef;}
}

Angular版本号维护在VERSION变量里：

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