vue安装 axios

1.安装axios

npm install axios -S

2.配置axios

在项目中新建api/index.js文件，用以配置axios

api/index.js

import axios from 'axios';

let http = axios.create({
  baseURL: 'http://localhost:8080/',
  withCredentials: true,
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8'
  },
  transformRequest: [function (data) {
    let newData = '';
    for (let k in data) {
      if (data.hasOwnProperty(k) === true) {
        newData += encodeURIComponent(k) + '=' + encodeURIComponent(data[k]) + '&';
      }
    }
    return newData;
  }]
});

function apiAxios(method, url, params, response) {
  http({
    method: method,
    url: url,
    data: method === 'POST' || method === 'PUT' ? params : null,
    params: method === 'GET' || method === 'DELETE' ? params : null,
  }).then(function (res) {
    response(res);
  }).catch(function (err) {
    response(err);
  })
}

export default {
  get: function (url, params, response) {
    return apiAxios('GET', url, params, response)
  },
  post: function (url, params, response) {
    return apiAxios('POST', url, params, response)
  },
  put: function (url, params, response) {
    return apiAxios('PUT', url, params, response)
  },
  delete: function (url, params, response) {
    return apiAxios('DELETE', url, params, response)
  }
}

这里的配置了POST、GET、PUT、DELETE方法。并且自动将JSON格式数据转为URL拼接的方式

同时配置了跨域，不需要的话将withCredentials设置为false即可

并且设置了默认头部地址为：http://localhost:8080/，这样调用的时候只需写访问方法即可

3.使用axios

注：PUT请求默认会发送两次请求，第一次预检请求不含参数，所以后端不能对PUT请求地址做参数限制

首先在main.js中引入方法

import Api from './api/index.js';
Vue.prototype.$api = Api;

然后在需要的地方调用即可

this.$api.post('user/login.do(地址)', {
    "参数名": "参数值"
}, response => {
     if (response.status >= 200 && response.status < 300) {
        console.log(response.data);\请求成功，response为成功信息参数
     } else {
        console.log(response.message);\请求失败，response为失败信息
     }
});