vue-resouce设置请求头

第一种：在Vue实例中设置var vm = new Vue({   el:'#rrapp',   data:{      showList: true,      title: null   },    http: {        root: '/',        headers: {            token: token        }    }
})第二种：全局设置请求头
Vue.http.headers.common['token'] = 'YXBpOnBhc3N3b3Jk';第三种：在拦截器中设置Vue.http.interceptors.push((request, next) => {        request.headers.set('token', token); //setting request.headers        next((response) => {            return response     })})