我开了json-server 然后ng serve 还是获取不到数据

来源：5-2 常见操作符（一）

weixin_慕桂英823842

2020-08-19

HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: “Unknown Error”, url: “http://localhost3000/quotes/2”, ok: false, …}
error: ProgressEvent {isTrusted: true, lengthComputable: false, loaded: 0, total: 0, type: “error”, …}
headers: HttpHeaders {normalizedNames: Map(0), lazyUpdate: null, headers: Map(0)}
message: "Http failure response for http://localhost3000/quotes/2: 0 Unknown Error"
name: "HttpErrorResponse"
ok: false
status: 0
statusText: "Unknown Error"
url: "http://localhost3000/quotes/2"
proto: HttpResponseBase

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