要在Angular中使用Service Worker缓存接收到的数据,可以按照以下步骤进行:
ng add @angular/pwa
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { SwUpdate } from '@angular/service-worker';
@Injectable({
providedIn: 'root'
})
export class DataCacheService {
private cacheName = 'data-cache';
constructor(private http: HttpClient, private swUpdate: SwUpdate) {
// 检查更新并刷新页面
if (this.swUpdate.isEnabled) {
this.swUpdate.available.subscribe(() => {
if (confirm('New version available. Load New Version?')) {
window.location.reload();
}
});
}
}
// 获取数据并缓存
public getData(): Promise {
const url = 'https://example.com/data';
const request = this.http.get(url).toPromise();
return request.then((response) => {
// 将数据缓存到Service Worker中
if ('caches' in window) {
caches.open(this.cacheName).then((cache) => {
cache.put(url, new Response(JSON.stringify(response)));
});
}
return response;
});
}
// 从缓存中获取数据
public getCachedData(): Promise {
const url = 'https://example.com/data';
return caches.open(this.cacheName).then((cache) => {
return cache.match(url).then((response) => {
if (response) {
return response.json();
}
});
});
}
}
import { Component, OnInit } from '@angular/core';
import { DataCacheService } from './data-cache.service';
@Component({
selector: 'app-data',
template: `
{{ data | json }}
`
})
export class DataComponent implements OnInit {
public data: any;
constructor(private dataCacheService: DataCacheService) { }
ngOnInit() {
this.dataCacheService.getData().then((response) => {
this.data = response;
});
}
}
import { Component, OnInit } from '@angular/core';
import { DataCacheService } from './data-cache.service';
@Component({
selector: 'app-cached-data',
template: `
{{ cachedData | json }}
`
})
export class CachedDataComponent implements OnInit {
public cachedData: any;
constructor(private dataCacheService: DataCacheService) { }
ngOnInit() {
this.dataCacheService.getCachedData().then((response) => {
this.cachedData = response;
});
}
}
这样就可以在Angular中使用Service Worker来缓存接收到的数据了。