1. axios请求方式

方式1：axios({method:"GET",url:"..."})

方式2：axios({method:"POST",url:"...",data:"..."})

方式3：axios.get("url...")

方式4：axios.post("url...","data...")

2. 安装axios

命令：npm install axios

3. 安装querystring

命令：npm install querystring，

注释：post请求提交数据用

4. 解决跨域访问

vue2.x和vue3.x的vue-cli项目解决案（在文件vue.config.js中追加下记代码）

 vue3.2的vite项目解决案（在文件vite.config.ts中追加下记代码）

5. 创建一个后端项目

用于测试处理的ajax请求

package releaseTest.controller;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import releaseTest.entity.User;/* Servlet implementation class AxiosTest*/
@WebServlet("/AxiosTest")
public class AxiosTest extends HttpServlet {private static final long serialVersionUID = 1L;/* Default constructor. */public AxiosTest() {}/* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setCharacterEncoding("utf-8");String id = request.getParameter("id");PrintWriter writer = response.getWriter();writer.write("{name:'张三'");writer.write(",id:"+id);writer.write(",age:18}");writer.flush();writer.close();}/* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");String type = request.getParameter("type");String name = request.getParameter("name");String age = request.getParameter("age");System.out.println("type:"+type);System.out.println("name:"+name);System.out.println("age:"+age);PrintWriter writer = response.getWriter();writer.write("{status:'200'");if("1".equals(type)) {writer.write(",msg:'ajax普通方案'}");} else {writer.write(",msg:'ajax快捷方案'}");}writer.flush();writer.close();}}

6. axios的4种请求方式