npm install axios qs --save 

import axios from 'axios'
import 'mint-ui/lib/style.css'
import qs from 'qs';
Vue.prototype.$ajax = axios // 把axios换成$ajax变量
Vue.prototype.$qs = qs;

this.$ajax
          .post("yyt.base.personal.card.create",this.$qs.stringify(param))
          .then(res => {
            let result = res.data;
            if (result.result_code == 0) {
              history.go(-1)
            } else {
              Toast(result.result_message);
            }
          });