2019独角兽企业重金招聘Python工程师标准>>> 
1. 注入 { provide: RouteReuseStrategy, useClass: SimpleReuseStrategy },
2.
import {ActivatedRouteSnapshot, DetachedRouteHandle, RouteReuseStrategy} from '@angular/router';
//页面缓存用的
export class SimpleReuseStrategy implements RouteReuseStrategy {
public static handlers: { [key: string]: DetachedRouteHandle } = {}
private static waitDelete:string
/** 表示对所有路由允许复用 如果你有路由不想利用可以在这加一些业务逻辑判断 */
public shouldDetach(route: ActivatedRouteSnapshot): boolean {
return true;
}
/** 当路由离开时会触发。按path作为key存储路由快照&组件当前实例对象 */
public store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
if(SimpleReuseStrategy.waitDelete && SimpleReuseStrategy.waitDelete==this.getRouteUrl(route)){
//如果待删除是当前路由则不存储快照
SimpleReuseStrategy.waitDelete=null
return;
}
SimpleReuseStrategy.handlers[this.getRouteUrl(route)] = handle
}
/** 若 path 在缓存中有的都认为允许还原路由 */
public shouldAttach(route: ActivatedRouteSnapshot): boolean {
return !!SimpleReuseStrategy.handlers[this.getRouteUrl(route)]
}
/** 从缓存中获取快照，若无则返回nul */
public retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle {
if (!route.routeConfig) {
return null
}
return SimpleReuseStrategy.handlers[this.getRouteUrl(route)]
}
/** 进入路由触发，判断是否同一路由 */
public shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
return future.routeConfig===curr.routeConfig &&
JSON.stringify(future.params)==JSON.stringify(curr.params);
}
private getRouteUrl(route: ActivatedRouteSnapshot){
return route['_routerState'].url.replace(/\//g, '_');
//+ '_' + (route.routeConfig.loadChildren || route.routeConfig.component.toString().split('(')[0].split(' ')[1] )
}
public static deleteRouteSnapshot(name:string):void{
if(SimpleReuseStrategy.handlers)
if(SimpleReuseStrategy.handlers[name]){
delete SimpleReuseStrategy.handlers[name];
}else{
SimpleReuseStrategy.waitDelete=name;
}
}
public static deleteRouteSnapshot2(name:string):void{
if(SimpleReuseStrategy.handlers[name]){
delete SimpleReuseStrategy.handlers[name];
}else{
SimpleReuseStrategy.waitDelete=name;
}
}
}