subject的意义

Question

 我想问问 这个subject的意义是什么额。 把一个值s设置为subject类型，通过next触发事件与直接更改值，都可以触发订阅事件吧？

public subject: Subject<User> = new Subject<User>();
 this.http.get(URL).map((response: Response) => {
                    let data= response.json();
                    this.subject.next(data);    
                });
                
 public user: User = new User();
 this.http.get(URL).map((response: Response) => {
                    let data = response.json();
                    this.user=data;
                });

Answer 1

提问者 MrXs 2017-06-15 18:17:57

public subject: Subject<User> = new Subject<User>();
 this.http.get(URL).map((response: Response) => {
                    let data= response.json();
                    this.subject.next(data);    
                });
                
 public user: User = new User();
 this.http.get(URL).map((response: Response) => {
                    let data = response.json();
                    this.user=data;
                });

这两种情况

Answer 2

JoJo 2017-06-15 18:01:24

什么？没太明白你想问什么，把代码贴出来看看：）

• 提问者 MrXs #1

  public subject: Subject<User> = new Subject<User>();
   this.http.get(URL).map((response: Response) => {
                      let data= response.json();
                      this.subject.next(data);    
                  });
                  
   public user: User = new User();
   this.http.get(URL).map((response: Response) => {
                      let data = response.json();
                      this.user=data;
                  });
  这两种情况