POST http://localhost:3000/admin/login 400（错误请求）login.component.ts:50 HttpErrorResponse {headers：HttpHeaders，status：400，statusText："Bad Request"，url：“http://localhost:3000/admin/login ", ok: false, …} error: {status: 0, message: "用户名不存在."} headers: HttpHeaders {normalizedNames: Map(0), lazyUpdate: null, lazyInit: ƒ} message: " http://localhost:3000/admin/login的Http失败响应：400错误请求" name: " HttpErrorResponse " ok: false status: 400 statusText: "错误请求" url: " http://localhost:3000/admin/login“ proto ：HttpResponseBase这是我的登录组件：
