供参考:https://github.com/MarkPieszak/aspnetcore-angular2-universal/blob/master/Client/app/platform-modules/app.browser.module.ts#L51
通用缓存对象在发送到客户端的 html 中以这样的初始状态进行全球添加:
<script>
window.UNIVERSAL_CACHE = { } // stuff gets loaded here
</script>
在我的browser.module.ts
中,我正在尝试加载该初始状态:
// imports
export const UNIVERSAL_KEY = 'UNIVERSAL_CACHE';
@ngModule({
// bootstrap, imports, providers, etc.
})
export class AppBrowserModule {
constructor(public cache: CacheService) {
this.doRehydrate();
}
// Universal Cache "hook"
doRehydrate() {
let defaultValue = {};
let serverCache = this._getCacheValue(CacheService.KEY, defaultValue);
this.cache.rehydrate(serverCache);
}
// Universal Cache "hook
_getCacheValue(key: string, defaultValue: any): any {
// Get cache that came from the server
const win: any = window;
/* I can console.log(win) to see the window object with .UNIVERSAL_CACHE, however if I console.log(win[UNIVERSAL_KEY]) it is undefined. */
if (win[UNIVERSAL_KEY] && win[UNIVERSAL_KEY][key]) {
let serverCache = defaultValue;
try {
serverCache = JSON.parse(win[UNIVERSAL_KEY][key]);
if (typeof serverCache !== typeof defaultValue) {
console.log('Angular Universal: The type of data from the server is different from the default value type');
serverCache = defaultValue;
}
} catch (e) {
console.log('Angular Universal: There was a problem parsing the server data during rehydrate');
serverCache = defaultValue;
}
return serverCache;
} else {
console.log('Angular Universal: UNIVERSAL_CACHE is missing');
}
return defaultValue;
}
}
不幸的是,win[UNIVERSAL_KEY]
始终是未定义的,即使我可以console.log(win)
并查看它,或者在开发工具中我可以键入并查看它console.log(window.UNIVERSAL_CACHE)
。 知道为什么会这样吗?
(我没有足够的声誉来评论)
问题来自这个似乎未完成的功能:https://github.com/angular/universal/blob/master/modules/platform-node/node-platform.ts#L418
当我想使消息在生产中消失时,我从生成的 js 文件中手动删除了 injectCacheInDocument
函数。