关于前端http请求timeout总结

• xmlhttprequest

let xhr = new XMLHttpRequest();

xhr.timeout = 120000 ;  // 单位ms
xhr.ontimeout = (e)=> {
  console.log(e)//超时回调函数
};

xhr.open('GET', '/server', true);
xhr.send(null);
xhr.onreadystatechange = ()=>{
    if(xhr.status === 4 && xhr.readyState == 200){
        console.log(xhr.responseText);
   }
 };

• angularJs

$http.get({ url: url, timeout: 120000 }).success(data)=>{})

• angular2+

	import { Http, Headers } from '@angular/http';
	import { Observable } from 'rxjs/Observable';
	
    post(url: string, params?: any): Observable {
        let headers = new Headers();
        headers.append("Content-Type", "application/json;charset=utf-8");
        return this.http.post(url, params, { headers: headers })
        				.timeout(120000 )   //单位ms
            			.map(response => response.json());
    }

• vue

export default {
    post(url, params) {
        return axios.post(url, params, { timeout: 120000 });  //单位ms
    }
 }

• 总结
  其实各大框架http服务都是对xmlhttprequest的封装，原理都是一样的。