axios基本使用
简介Axios，是一个基于promise 的网络请求库，作用于node.js和浏览器中，它是 isomorphic 的(即同一套代码可以运行在浏览器和node.js中)。在服务端它使用原生node.js http模块, 而在客户端 (浏览端) 则使用XMLHttpRequest。
特点：
从浏览器创建 XMLHttpRequests从 node.js 创建 http 请求支持 Promise API拦截请求和响应转换请求和响应数据取消请求自动转换JSON数据客户端支持防御XSRF总结：对ajax的优化。
基础语法首先是需要导入相关的js文件
axios-0.18.0.js
代码语言：javascript代码运行次数：0运行复制/* axios v0.18.0 | (c) 2018 by Matt Zabriskie */
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o=n(23);r.prototype.throwIfRequested=function(){if(this.reason)throw this.reason},r.source=function(){var e,t=new r(function(t){e=t});return{token:t,cancel:e}},e.exports=r},function(e,t){"use strict";e.exports=function(e){return function(t){return e.apply(null,t)}}}])}); */ //# sourceMappingURL=axios.min.map这篇文章的特点在于，是对于这一篇文章Ajax的基础使用，将这篇文章中的内容使用axios，进行优化。大家学完了之后可以，看一下这一篇文章进行练习一下。 springboot+vue+mybatis-plus+axios实现商品的CRUD 项目创建第一步： 第二步： 添加配置文件各种依赖 pom.xml 代码语言：javascript代码运行次数：0运行复制 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 数据库建表语句代码语言：javascript代码运行次数：0运行复制/* Navicat MySQL Data Transfer Source Server : 本机 Source Server Type : MySQL Source Server Version : 80024 Source Host : localhost:3306 Source Schema : projectdatabase Target Server Type : MySQL Target Server Version : 80024 File Encoding : 65001 Date: 11/01/2023 20:27:49 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for user -- ---------------------------- DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int NOT NULL AUTO_INCREMENT, `username` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, `password` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = DYNAMIC; -- ---------------------------- -- Records of user -- ---------------------------- INSERT INTO `user` VALUES (1, 'LIHUA', '123456'); INSERT INTO `user` VALUES (2, 'zhangsan', '123'); INSERT INTO `user` VALUES (3, 'LISI', '456489'); INSERT INTO `user` VALUES (4, 'heheheh', '123456'); INSERT INTO `user` VALUES (5, 'ahuang', '123'); INSERT INTO `user` VALUES (6, 'dsdad', '154654'); SET FOREIGN_KEY_CHECKS = 1;项目结构一定注意一点，就是这个后端的java类，一定要写在Springbootlogincheck包下面，不然会导致网址访问不到404错误。 User类代码语言：javascript代码运行次数：0运行复制package com.example.springbootlogincheck.Bean; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @AllArgsConstructor @NoArgsConstructor public class User { private Integer id; private String username; private String password; }IndexController类代码语言：javascript代码运行次数：0运行复制package com.example.springbootlogincheck.Controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class IndexController { @RequestMapping("/") public String index(){ return"admin/register.html"; } }UserController代码语言：javascript代码运行次数：0运行复制package com.example.springbootlogincheck.Controller; import com.example.springbootlogincheck.Bean.User; import com.example.springbootlogincheck.Dao.UserDao; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.BufferedReader; import java.io.IOException; import java.util.List; @Controller public class UserController { @Autowired UserDao userDao; @ResponseBody @GetMapping("/selectUser") public Boolean SelectUser(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = request.getParameter("username"); System.out.println(username); boolean flag = false; List for (User user : list){ if (user.getUsername().equals(username)){ flag = true; } } System.out.println(flag); if (flag) { // response.reset(); return true; } return false; } }UserDao代码语言：javascript代码运行次数：0运行复制package com.example.springbootlogincheck.Dao; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.example.springbootlogincheck.Bean.User; import org.apache.ibatis.annotations.Mapper; @Mapper public interface UserDao extends BaseMapper }前端网页register.css代码语言：javascript代码运行次数：0运行复制* { margin: 0; padding: 0; list-style-type: none; } .reg-content{ padding: 30px; margin: 3px; } a, img { border: 0; } body { background-image: url("../imgs/reg_bg_min.jpg") ; text-align: center; } table { border-collapse: collapse; border-spacing: 0; } td, th { padding: 0; height: 90px; } .inputs{ vertical-align: top; } .clear { clear: both; } .clear:before, .clear:after { content: ""; display: table; } .clear:after { clear: both; } .form-div { background-color: rgba(255, 255, 255, 0.27); border-radius: 10px; border: 1px solid #aaa; width: 424px; margin-top: 150px; margin-left:1050px; padding: 30px 0 20px 0px; font-size: 16px; box-shadow: inset 0px 0px 10px rgba(255, 255, 255, 0.5), 0px 0px 15px rgba(75, 75, 75, 0.3); text-align: left; } .form-div input[type="text"], .form-div input[type="password"], .form-div input[type="email"] { width: 268px; margin: 10px; line-height: 20px; font-size: 16px; } .form-div input[type="checkbox"] { margin: 20px 0 20px 10px; } .form-div input[type="button"], .form-div input[type="submit"] { margin: 10px 20px 0 0; } .form-div table { margin: 0 auto; text-align: right; color: rgba(64, 64, 64, 1.00); } .form-div table img { vertical-align: middle; margin: 0 0 5px 0; } .footer { color: rgba(64, 64, 64, 1.00); font-size: 12px; margin-top: 30px; } .form-div .buttons { float: right; } input[type="text"], input[type="password"], input[type="email"] { border-radius: 8px; box-shadow: inset 0 2px 5px #eee; padding: 10px; border: 1px solid #D4D4D4; color: #333333; margin-top: 5px; } input[type="text"]:focus, input[type="password"]:focus, input[type="email"]:focus { border: 1px solid #50afeb; outline: none; } input[type="button"], input[type="submit"] { padding: 7px 15px; background-color: #3c6db0; text-align: center; border-radius: 5px; overflow: hidden; min-width: 80px; border: none; color: #FFF; box-shadow: 1px 1px 1px rgba(75, 75, 75, 0.3); } input[type="button"]:hover, input[type="submit"]:hover { background-color: #5a88c8; } input[type="button"]:active, input[type="submit"]:active { background-color: #5a88c8; } .err_msg{ color: red; padding-right: 170px; } #password_err,#tel_err{ padding-right: 195px; } #reg_btn{ margin-right:50px; width: 285px; height: 45px; margin-top:20px; } #checkCode{ width: 100px; } #changeImg{ color: aqua; }imga.jpg reg_bg_min.jpg register.htmljs部分 在这个js部分里面，一个点需要注意一下，就是这个responseText这个属性，这个属性接受的值首先是String类型，然后了，这个值就是访问的链接下对应的方法的返回值的对应的String类型格式。 代码语言：javascript代码运行次数：0运行复制完整代码： 代码语言：javascript代码运行次数：0运行复制
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效果展示：
如果输入的账户在失去焦点之后，发现这个用户没有在数据库中存在就不会发生啥。
如果存在的话就显示这个信息，已经存在了。