Vue+Echarts 项目演练（中）后台数据接口的创建

news2024/11/18 2:46:00

全局引用Echarts与axios

后台接口创建express路由

api接口数据创建

全局引用Echarts与axios

vue3.0的挂载方式：使用Provide/Inject依赖注入，将替代vue2中在原型链上挂载一些属性在app.vue中使用provider来给后代们提供数据

<script>
import { provide } from "vue"; //导入vue解构出Provider
import * as echarts from "echarts"; //引入echarts

export default {
  setup(){//启动方法
    //provider("名字","传递的内容")
    provide("echarts",echarts) 
  }
}
</script>

在主页面中使用接受函数

import {inject} from "vue"; //引入inject接受数据
export default {
  setup(){//启动方法
    //inject("名字")
    let $echarts = inject("echarts")
    console.log($echarts)//查看打印所有属性
    inject()
  },
}

查看输出的$echarts的所有属性

axios使用于上面相同方式

axios的下载：npm install --save axios

注入axios

<script>
import { provide } from "vue"; //导入vue解构出Provider
import * as echarts from "echarts"; //引入echarts
import * as axios from "axios";

export default {
  setup(){//启动方法
    //provider("名字","传递的内容")
    provide("echarts",echarts) 
    provide("axios",axios)
  }
}
</script>

主页面定义变量接收

let $http = inject("axios")

查看输出的$http的所有属性

后台接口创建express路由

创建目录server 在目录下创建index文件与router文件夹

新建对应路由，在fouter文件夹下创建对应的四个路由文件

安装express：npm install --save express

对四个路由文件进行设置

const express = require("express"); //引用
const router = express.Router(); //实现路由并存放

//设置路由
//router.get("路由地址",路由函数)
router.get("/data",(req,res) => { //req 请求,res 响应
    res.send({msg:"我是one的响应路由地址"})
}) 

//暴露
module.exports = router;

在index.js文件中创建路由合并和http服务

const express = require("express"); //引用
const app = express(); //创建express对象

//引用路由文件
let chart1 = require("./router/one.js");
let chart2 = require("./router/two.js");
let chart3 = require("./router/three.js");
let chart4 = require("./router/four.js");

//使用路由：使用中间见来配置路由
app.use("/one",chart1)
app.use("/two",chart2)
app.use("/three",chart3)
app.use("/four",chart4)

//监听端口
app.listen(3000) //端口号自己可以随便设置

在命令提示符中测试：node index.js

在端口页面中查看

api接口数据创建

在server目录下创建datas目录并放取4个json数据文件

one.json:

{
    "chartData":[
        {"title":"冰箱","num":1827},
        {"title":"洗衣机","num":342},
        {"title":"电视机","num":541},
        {"title":"微波炉","num":1347},
        {"title":"烤箱","num":2431},
        {"title":"空调","num":876},
        {"title":"洗碗机","num":1578}
    ]
}

two.json:

{
    "chartData":{
        "day":["星期1","星期2","星期3","星期4","星期5","星期6","星期7"],
        "num":{
            "Clothes":[140, 232, 101, 264, 90, 340, 250],
            "digit":[120, 282, 111, 234, 220, 340, 310],
            "Electrical":[320, 132, 201, 334, 190, 130, 220],
            "gear":[220, 402, 231, 134, 190, 230, 120],
            "Chemicals":[220, 302, 181, 234, 210, 290, 150]
      
        }
    }
}

three.json:

{
    "chartData":[
        { "value": 567, "name":"服饰" },
        { "value": 123, "name":"数码" },
        { "value": 324, "name":"家电" },
        { "value": 89, "name":"家居" },
        { "value": 453, "name":"日化" },
        { "value": 767, "name":"熟食" }
     
      ]
}

four.json:

{
    "chartData":{
        "day":["星期1","星期2","星期3","星期4","星期5","星期6","星期7"],
        "num":{
            "Clothes":[320, 502, 401, 334, 390, 430, 720],
            "digit":[234, 564, 443, 234, 754, 430, 321],
            "Electrical":[220, 321, 335, 534, 390, 330, 310],
            "gear":[269, 212, 491, 368, 341, 330, 410],
            "Chemicals": [820, 832, 901, 934, 1290, 1330, 1320]
      
        }
      }
}

对四处文件进行引用并且把数据返回给前台

const express = require("express"); //引用
const router = express.Router(); //实现路由并存放

let oneData = require("../datas/one.json") //数据引用到前台
//设置路由
//router.get("路由地址",路由函数)
router.get("/data",(req,res) => { //req 请求,res 响应
    res.send({msg:"我是one的响应路由地址",chartData1:oneData})
}) 

//暴露
module.exports = router;