vue-resource 拦截器interceptors使用详解

/*引入Vue框架*/
import Vue from 'vue'
/*引入资源请求插件*/
import VueResource from 'vue-resource'

/*使用VueResource插件*/
Vue.use(VueResource)

Vue.http.interceptors.push((request, next) => {
　console.log(this)//此处this为请求所在页面的Vue实例
 // modify request
 request.method = 'POST';//在请求之前可以进行一些预处理和配置

 // continue to next interceptor
　　next((response) => {//在响应之后传给then之前对response进行修改和逻辑判断。对于token时候已过期的判断，就添加在此处，页面中任何一次http请求都会先调用此处方法
  　　response.body = '...';
　　　　return response;

 });
});

//1、添加一个loading组件
<template id='loading-template'>
  <div class='loading-overlay'></div>
</template>

//2、将loading组件作为另外一个Vue实例的子组件
var help = new Vue({
  el: '#help',
  data: {
    showLoading: false
  },
  components: {
    'loading': {
      template: '#loading-template',
    }
  }
})

//3、将该Vue实例挂载到某个HTML元素
<div id='help'>
  <loading v-show='showLoading'></loading>
</div>

//4、添加inteceptor
Vue.http.interceptors.push((request, next) => {
  loading.show = true;
  next((response) => {
    loading.show = false;
    return response;
  });
});

//1、继续沿用上面的loading组件，在#help元素下加一个对话框
<div id='help'>
  <loading v-show='showLoading' ></loading>
  <modal-dialog :show='showDialog'>
    <header class='dialog-header' slot='header'>
      <h3 class='dialog-title'>Server Error</h3>
    </header>
    <div class='dialog-body' slot='body'>
      <p class='error'>Oops,server has got some errors, error code: {{errorCode}}.</p>
    </div>
  </modal-dialog>
</div>

//2、给help实例的data选项添加两个属性
var help = new Vue({
    el: '#help',
    data: {
      showLoading: false,
      showDialog: false,
      errorCode: ''
    },
    components: {
      'loading': {
        template: '#loading-template',
      }
    }
  })

//3、修改inteceptor
Vue.http.interceptors.push((request, next) => {
  help.showLoading = true;
  next((response) => {
    if(!response.ok){
      help.errorCode = response.status;
      help.showDialog = true;
    }
    help.showLoading = false;
    return response;
  });
});