小编Sai*_*uri的帖子

在使用 GET 方法从 API 调用中获取时，我遇到了这样的问题

core.js:6014 错误错误：未捕获（承诺）：NullInjectorError：StaticInjectorError(AppModule)[HomeComponent -> HttpHeaders]：StaticInjectorError(Platform：core)[HomeComponent -> HttpHeaders]：NullInjectorError：没有提供 HttpHeaders！NullInjectorError: StaticInjectorError(AppModule)[HomeComponent -> HttpHeaders]: StaticInjectorError(Platform: core)[HomeComponent -> HttpHeaders]: NullInjectorError: No provider for HttpHeaders！在 NullInjector.get (core.js:855) at resolveToken (core.js:17513) at tryResolveToken (core.js:17439) at StaticInjector.get (core.js:17265) at resolveToken (core.js:17513) at tryResolveToken (core.js:17439) at StaticInjector.get (core.js:17265) at resolveNgModuleDep (core.js:30392) at NgModuleRef_.get (core.js:

代码：

return this.http
      .get('http://localhost/advanced/frontend/web/leftside-menu/get-left-menu')
      .subscribe(
        (result) => { }
      );