angular7/8 read local json的2种方法

环境搭建

ng new angular-demo

// assets/data.json 
[
    {
        "letter": "A",
        "frequency": 0.08167
    },
    {
        "letter": "B",
        "frequency": 0.01492
    },
    {
        "letter": "C",
        "frequency": 0.02782
    },
    {
        "letter": "D",
        "frequency": 0.04253
    },
    {
        "letter": "E",
        "frequency": 0.12702
    },
]

// tsconfig.json compilerOptions 配置 json ，否在json依赖编译失败
 "resolveJsonModule": false, 

typescript2.9+ import

import { HttpClient } from '@angular/common/http';
import { Component } from '@angular/core';
import * as data from '../assets/data.json';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  products:any;

  constructor(private http: HttpClient) {
    const res  = (data as any).default;
    console.log(res);
  }
}

Angular HttpClient

// app.module.ts 别忘了imports HttpClientModule 
import { HttpClient } from '@angular/common/http';
import { Component } from '@angular/core';


@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  products:any;

  constructor(private http: HttpClient) {
    this.http.get('assets/data.json').subscribe(data =>{
      console.log('data....',data);
      this.products = data;
    })
  }
}

Es6 import in Angular offline

//src/app 下添加 json-typings.d.ts 
declare module "*.json" {
    const value: any;
    export default value;
}

//app.component.s 
import { HttpClient } from '@angular/common/http';
import { Component } from '@angular/core';
import * as data from "data.json"

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  products:any;

  constructor(private http: HttpClient) {
    console.log(data);
  }
}

参考文献

• angular-local-json

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