cache.service.ts
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	import { Injectable } from '@angular/core';

	@Injectable({
	providedIn: 'root'
	})
	export class CacheService {
	cache = {};

	constructor() { }

	public getItem(key: string): any {
	try {
	return JSON.parse(localStorage.getItem(key));
	} catch(e) {
	try {
	return this.cache[key];
	} catch(e){
	return null;
	}
	}
	}
	public removeItem(key: string){
	try { delete this.cache[key]; } catch(e){}
	try { localStorage.removeItem(key); } catch(e){}
	}
	public setItem(key: string, data: any){
	this.cache[key] = data;
	try {
	localStorage.setItem(key, JSON.stringify(data));
	} catch(e) {
	localStorage.clear();
	}
	}
	}