当在Angular中出现错误“依赖数组必须有参数”时,通常是因为在组件或服务的构造函数中未正确地声明依赖项。以下是解决此错误的示例代码:
import { Component, OnInit } from '@angular/core';
import { SomeService } from 'path-to-some-service';
@Component({
selector: 'app-my-component',
templateUrl: './my-component.component.html',
styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
constructor(private someService: SomeService) { } // 此处声明了依赖项
ngOnInit() {
// 组件初始化逻辑
}
}
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
@Injectable({
providedIn: 'root'
})
export class SomeService {
constructor(private http: HttpClient) { } // 此处声明了依赖项
// 其他服务方法
}
请确保在构造函数参数前加上修饰符(例如private
,public
等),以便将其识别为依赖项。