Angular8 Http拦截器简单使用教程

this.http.post('http://127.0.0.1:8080/api/getList', {
   header: {
    token: 'asdasdas'
   },
   observe: 'body',
   params: {
    pageSize: 10,
    pageIndex: 1
   },
   responseType: 'json',
   withCredentials: true
  });

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpEvent, HttpHandler, HttpRequest, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';
const ignoreToken = ['login', 'logout', 'table'];
@Injectable()
export class CommonInterceptor implements HttpInterceptor {
 intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  // 先补全请求协议
  let url = req.url;
  const needToken = ignoreToken.filter(u => url.match(u));
  if (url.indexOf('http://') < 0 || url.indexOf('https://') < 0) {
   url = 'http://' + url;
  }
  // 过滤掉不需要token的请求
  if (!needToken.length) {
   req = req.clone({
    url
   });
  } else {
   req = req.clone({
    url,
    headers: req.headers.set('token', 'asdqwe')
   });
  }
  return next.handle(req).pipe(
   tap(
    event => {
     if (event instanceof HttpResponse) {
      console.log(event);
      if (event.status >= 500) {
       // 跳转错误页面
      }
     }
    },
    error => {
     // token过期 服务器错误等处理
    })
  );
 }
}

getTemp() {
  this.http.post('172.16.10.161:3000/table', {
   params: {
    pageSize: 10,
    pageIndex: 1
   }
  }).subscribe(res => {
   console.log(res);
  });
 }

{ provide: HTTP_INTERCEPTORS, useClass: CommonInterceptor, multi: true }