创建VUE2 前端以及后端的交互

创建vue2项目

1.javascript–>vue(不要勾选)–>安装element-ui(组件 | Element)–>执行指令（npm i element-ui -S）–>在main.js中引入（import ElementUI from ‘element-ui’;

​ import ‘element-ui/lib/theme-chalk/index.css’;），再引入使用指令

（Vue.use(ElementUI);）

引入后最终样式为

import Vue from 'vue'
import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css';
import App from './App.vue'

Vue.config.productionTip = false
Vue.use(ElementUI);//引入执行指令

new Vue({
  render: h => h(App),
}).$mount('#app')

2.安装axios(Axios 中文文档 | Axios 中文网 | Axios 是一个基于 promise 的网络请求库，可以用于浏览器和 node.js (axios-http.cn))–>起步–>安装(npm install axios)

3.进入vue-router官网(Vue Router | The official Router for Vue.js (vuejs.org))（安装vue-router才可以写页面）–>安装指令(npm install vue-router@3)(@3就是2版本，@4就是3版本)–>

创建子页面

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创建路由跟index.js

index.js里面的内容

//路由需要用到哪些页面
import VueRouter from "vue-router"
import SystemIndex from "@/components/SystemIndex";
import UserLogin from "@/components/UserLogin";
import UserManger from "@/components/page/UserManger";
import DictManager from "@/components/page/DictManager";

const router = new VueRouter({
    //createWebHistory() 没有#，而是直接修改地址栏，可能和后台冲突，或者和nginx配置冲突
    //createWebHashHistory() 路由地址前会有# 推荐
    routes: [{
        path: "/", component: SystemIndex,children:[//子路由
            {path:"user",component:UserManger},
            {path:"dict",component:DictManager}
        ]
    }, {
        path: "/login", component: UserLogin,
    }]
})
export default router;

在main.js中引用router

import Vue from 'vue'
import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css';
import App from './App.vue'
import router from "@/router";

import VueRouter from "vue-router";
Vue.config.productionTip = false
Vue.use(ElementUI);
Vue.use(VueRouter);

new Vue({
  render: h => h(App),router
}).$mount('#app')

创建vue3项目

1.安装npm install vue-router@4（vue3）–>进入element-plus(设计 | Element Plus (gitee.io))–>安装指令(npm install element-plus --save)–>安装axios(npm install axios )

在main.js中引用使用

import { createApp } from 'vue'
import App from './App.vue'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'

let app = createApp(App)

app.use(ElementPlus).mount('#app')

App中添加调用

创建路由引入router

//路由需要用到哪些页面
import {createRouter, createWebHashHistory} from "vue-router"
import UserLogin from "@/components/UserLogin";
import SystemIndex from "@/components/SystemIndex";
import UserManger from "@/components/page/UserManger";
import DictManager from "@/components/page/DictManager";

const router = createRouter({
    //createWebHistory() 没有#，而是直接修改地址栏，可能和后台冲突，或者和nginx配置冲突
    //createWebHashHistory() 路由地址前会有# 推荐
    history: createWebHashHistory(), routes: [{
        path: "/", component: UserLogin
    }, {
        path: "/index", component: SystemIndex,children:[//子路由
            {path:"user",component:UserManger},
            {path:"dict",component:DictManager}
        ]
    }]
})
export default router;

import { createApp } from 'vue'
import App from './App.vue'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'

import router from "@/router";

let app = createApp(App)

app.use(ElementPlus).use(router).mount('#app')

vue2项目

UserLogin.vue（登录页面代码）

<template>
  <div id="app">
    <div id="admin">
      <div class="pos" v-loading="loading">
        <h1 class="adminh1">华贵物业</h1>
        <el-form
            :model="ruleForm"
            status-icon
            :rules="rules"
            ref="ruleForm"
            label-width="100px"
            class="demo-ruleForm"
        >
          <el-form-item label="用户名：" prop="pass">
            <el-input
                prefix-icon="el-icon-user"
                style="width: 250px"
                type="text"
                v-model="ruleForm.pass"
                autocomplete="off"
            ></el-input>
          </el-form-item>
          <el-form-item label="密 码：" prop="checkPass">
            <el-input
                prefix-icon="el-icon-menu"
                style="width: 250px"
                show-password
                type="password"
                v-model="ruleForm.checkPass"
                autocomplete="off"
            ></el-input>
          </el-form-item>
          <el-form-item>
            <el-button type="primary" @click="submitForm('ruleForm')"
            >提交</el-button
            >
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "UserLogin",
  data() {
    var validatePass = (rule, value, callback) => {
      if (value === "") {
        callback(new Error("请输入用户信息"));
      } else {
        if (this.ruleForm.checkPass !== "") {
          this.$refs.ruleForm.validateField("checkPass");
        }
        callback();
      }
    };
    var validatePass2 = (rule, value, callback) => {
      if (value === "") {
        callback(new Error("请输入密码"));
      } else if (value.length < 8 || value.length > 13) {
        callback(new Error("长度必须在8-12之内!"));
      } else {
        callback();
      }
    };
    return {
      loading: false,
      ruleForm: {
        pass: "",
        checkPass: "",
      },
      rules: {
        pass: [{ validator: validatePass, trigger: "blur" }],
        checkPass: [{ validator: validatePass2, trigger: "blur" }],
      },
    };
  },
  methods: {
    submitForm(formName) {
      this.$refs[formName].validate((valid) => {
        if (valid) {
          this.loading = true;
          setTimeout(() => {
            this.loading = false;
          }, 2000);
        } else {
          console.log("error submit!!");
          return false;
        }
      });
    },
    resetForm(formName) {
      this.$refs[formName].resetFields();
    },
  }
}
</script>

<style scoped>


#app {
  font-family: "Avenir", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #2c3e50;
}
#admin {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -200px;
  margin-left: -250px;
  width: 500px;
  height: 400px;
  background: #fff;
  border-radius: 10%;
  box-shadow: 8px 10px 10px rgb(177, 223, 242);
}
.adminh1 {
  margin: 20px 0;
  text-shadow: 10px 13px 3px rgb(207, 207, 207);
  text-align: center;
}
.pos {
  width: 450px;
  height: 350px;
  position: absolute;
  top: 25px;
  left: 25px;
}

</style>

SystemIndex.vue（首页代码）

<template>
  <div class="system">
    <el-container>
      <el-header class="header" >
        <el-row>
          <el-col :span="12">
            <div class="logo">
              <i class="el-icon-s-home" ></i>
              华贵物业
            </div>
          </el-col>
          <el-col :span="12">
            <div class="avatar">
            <el-avatar> user </el-avatar>
          </div>
          </el-col>
        </el-row>

      </el-header>
      <el-container>
        <el-aside width="200px">
          <LeftMenu></LeftMenu><!--左菜单栏引用-->
        </el-aside>
        <el-main class="main">
          <router-view/><!--路由子页面引用-->
        </el-main>
      </el-container>
    </el-container>

  </div>
</template>

<script>


import LeftMenu from "@/components/com/LeftMenu";
export default {
  name: "SystemIndex",
  components: {LeftMenu},
}
</script>

<style scoped>
.system{
  background-color: white;
  height: 100vh;
}
.main{
  background-color: white;
}

.header{
  background-color: cadetblue;
  color: white;
}
.logo{
  font-size: 26px;
  line-height: 60px;
  text-indent: 10px;
}
.avatar{
  float: right;
  margin-top: 10px;
}
</style>

UserManger.vue

<template>
<div>
  <h1>用户管理</h1>
  <el-table :data="tableData">
    <el-table-column prop="date" label="日期" width="140">
    </el-table-column>
    <el-table-column prop="name" label="姓名" width="120">
    </el-table-column>
    <el-table-column prop="address" label="地址">
    </el-table-column>
  </el-table>
</div>
</template>

<script>
export default {
  name: "UserManger",
  data() {
    const item = {
      date: '2016-05-02',
      name: '王小虎',
      address: '上海市普陀区金沙江路 1518 弄'
    };
    return {
      tableData: Array(10).fill(item)
    }
  }
}
</script>

<style scoped>

</style>

DictManager.vue

<template>
<h1>字典</h1>
</template>

<script>
export default {
  name: "DictManager"
}
</script>

<style scoped>

</style>

LeftMenu.vue

<template>
  <el-menu :default-openeds="['1', '3']">
    <el-submenu index="1">
      <template slot="title"><i class="el-icon-message"></i>导航一</template>
      <el-menu-item-group>
        <template slot="title">分组一</template>
        <el-menu-item index="1-1">
          <router-link to="/index/user" class="link">用户管理</router-link>
          </el-menu-item>
        <el-menu-item index="1-2">
          <router-link to="/index/dict" class="link">字典管理</router-link>
          </el-menu-item>
      </el-menu-item-group>
      <el-menu-item-group title="分组2">
        <el-menu-item index="1-3">选项3</el-menu-item>
      </el-menu-item-group>
      <el-submenu index="1-4">
        <template slot="title">选项4</template>
        <el-menu-item index="1-4-1">选项4-1</el-menu-item>
      </el-submenu>
    </el-submenu>
    <el-submenu index="2">
      <template slot="title"><i class="el-icon-menu"></i>导航二</template>
      <el-menu-item-group>
        <template slot="title">分组一</template>
        <el-menu-item index="2-1">选项1</el-menu-item>
        <el-menu-item index="2-2">选项2</el-menu-item>
      </el-menu-item-group>
      <el-menu-item-group title="分组2">
        <el-menu-item index="2-3">选项3</el-menu-item>
      </el-menu-item-group>
      <el-submenu index="2-4">
        <template slot="title">选项4</template>
        <el-menu-item index="2-4-1">选项4-1</el-menu-item>
      </el-submenu>
    </el-submenu>

  </el-menu>
</template>

<script>
export default {
  name: "LeftMenu"
}
</script>

<style scoped>
.el-menu-item.is-active .link{
  color: #409EFF;
}
.link{
  color: black;
  text-decoration: none;
}
.link:active{
  color: black;
}
</style>

vue2登录处理

表单校验

导入axios

提交表单处发axios

新增一个类

vo视图层对象，用来返回给前端的时候的一些封装，常用来做分页，统一返回的情况

po用来接收参数的对象

修改后台

swagger测试

Swagger UI

做一个请求工具类，所有请求用它来发

import axios from "axios";


function request(url,data){
    axios.post('http://localhost:8080/'+url, data)
        .then( (response)=> {
            if (response.data.success){
                return response.data.data;
            }else {
                this.$message("网络故障"+response.data.message);
            }
        })
        .catch( (error) =>{
            this.$message("网络故障"+error);
        });
}

export default request;

方法调用的时候在前面指明await，当前方法前面加async

改动后的request.js

import axios from "axios";


function request(url,data){
    return new Promise((resolve,reject)=>{
        axios.post('http://localhost:8080/'+url, data)
            .then( (response)=> {
                if (response.data.success){
                    resolve (response.data.data);
                }else {
                    alert(response.data.message);
                    reject();
                }
            })
            .catch( (error) =>{
                alert("网络故障"+error);
                reject();
            });
    })

}

export default request;

UserLogin.vue

methods: {
  submitForm(formName) {
    this.$refs[formName].validate(async (valid) => {
      if (valid) {
          let data = await request("login",this.ruleForm);
          console.info(data);
      } else {
        this.$message("请认真提交表单")
        return false;
      }
    });
  },
  resetForm(formName) {
    this.$refs[formName].resetFields();
  },
}

再改

methods: {
  submitForm(formName) {
    this.$refs[formName].validate(async (valid) => {
      if (valid) {
          let data = await request("login",this.ruleForm);
          localStorage.token = data;
          this.$router.push("/index/user")//跳转到指定路由
      } else {
        this.$message("请认真提交表单")
        return false;
      }
    });
  },
  resetForm(formName) {
    this.$refs[formName].resetFields();
  },
}