出错提示: angular2 Property 'map' does not exist on type 'Observable<Response>' 类型“Observable<Response>”上不存在属性“map” 解决: 引入 rxjs/add/operator/map import 'rxjs/add/operator/map
package com.swift; public class Switch_Test { public static void main(String[] args) { /* * switch语句能否作用在byte上,能否作用在long上,能否作用在String上? */ byte zijie = 3; System.out.println(zijie); long changzheng=3; switch (changzheng) { //cannot switch on a value