This displays Hello World successfully so app.component.ts is bootstrapping correctly. Either no data returned from the DataService or it can't be displayed. There are no compiler errors. Is there a popup window in TypeScript like alert() in JavaScript that I could quickly check to see if data is being returned by the DataService? This displays Hello World successfully so app.c
阅读背景：
TypeScript for ASP.NET 5中的Angular 2 DataService不显示数据
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