服务器端代码
有index.js和package.json
- 文件名index.js
const express = require("express")
const jwt = require("jsonwebtoken")
const app = express()
let STU_ARR = [
{ id: "1", name: "孙悟空", age: 18, gender: "男", address: "花果山" },
{ id: "2", name: "猪八戒", age: 28, gender: "男", address: "高老庄" },
{ id: "3", name: "沙和尚", age: 38, gender: "男", address: "流沙河" },
]
/********************中间件***********************************/
app.use(express.urlencoded({ extended: true }));
app.use(express.json());
app.use((req, res, next) => {
res.setHeader("Access-Control-Allow-Origin", "http://127.0.0.1:5500");
res.setHeader("Access-Control-Allow-Methods", "GET,POST,DELETE,PUT,PATCH");
res.setHeader("Access-Control-Allow-Headers", "Content-type,Authorization");
next();
})
/********************路由***********************************/
// 登录路由
app.post("/login", (req, res) => {
const { username, password } = req.body;
if (username == "admin" && password == "123") {
// 生成token
const token = jwt.sign({ id: "12345", username: "admin", nickname: "超级管理员" }, "chaojianquanmima", { expiresIn: "1d" })
res.send({
status: "ok",
data: {
token,
nickname: "超级管理员"
}
})
} else {
res.status(403)
res.send({
status: "error",
data: "用户名或密码错误"
})
}
})
// 获取学生信息的路由
app.get("/students", (req, res) => {
console.log("收到students的get请求");
try {
// 获取、解码token
const token = req.get("Authorization").split(" ")[1];
const decodeToken = jwt.verify(token, "chaojianquanmima")
res.send({ status: "ok", data: STU_ARR });
} catch (e) {
console.log("解码错误，token无效");
res.status(403).send({ status: "error", data: "数据无效" })
}
})
// 查询某个学生的信息
app.get("/students/:id", (req, res) => {
const id = req.params.id;
const stu = STU_ARR.find((item) => { return item.id === id });
if (stu) {
res.send({ status: "ok", data: stu })
} else {
res.status(403);
res.send({ status: "failed" })
}
})
// 添加学生信息的路由
app.post("/students", (req, res) => {
console.log("收到students的post请求", req.body);
const { name, age, gender, address } = req.body;
const stu = {
id: +STU_ARR.at(-1).id + 1 + "",
name: name,
age: +age,
gender: gender,
address: address
};
// 获取学生信息
STU_ARR.push(stu);
res.send({
status: "ok",
data: stu
});
})
// 删除学生的路由
app.delete("/students/:id", (req, res) => {
console.log("向/students发送delete请求");
const id = req.params.id;
for (let i = 0; i < STU_ARR.length; i++) {
if (STU_ARR[i].id === id) {
const delStu = STU_ARR[i]
STU_ARR.splice(i, 1);
res.send({ status: "ok", data: delStu });
return
}
}
res.status(403);
res.send({ status: "error", data: "学生id不存在" });
})
// 修改学生信息
app.put("/students", (req, res) => {
console.log("向/students发送put请求");
const { id, name, age, gender, address } = req.body;
const editStu = STU_ARR.find((item) => { return item.id === id })
if (editStu) {
editStu.name = name;
editStu.age = age;
editStu.gender = gender;
editStu.address = address;
res.send({ status: "ok", data: editStu })
} else {
res.status(403)
res.send({ status: "error", data: "学生不存在" })
}
})
//
app.get("/test", (req, res) => {
console.log("收到发送给/test的get请求");
})
app.listen(3000, () => {
console.log("服务器启动");
})
-
package.json
{ "name": "my-server", "version": "1.0.0", "main": "index.js", "license": "MIT", "dependencies": { "express": "^4.18.2", "jsonwebtoken": "^9.0.1" } }
客户端代码
- login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
table {
border-collapse: collapse;
width: 50%;
}
tr,
td {
font-size: 20px;
text-align: center;
border: 1px solid black;
}
caption {
font-size: 30px;
font-weight: bold;
}
</style>
</head>
<body>
<div id="login">
<h1>请登录后再操作</h1>
<h2 id="info"></h2>
<form>
<div>
<input type="text" id="username">
</div>
<div>
<input type="password" id="password">
</div>
<div>
<input type="button" id="login-btn" value="登录">
</div>
</form>
</div>
<div id="list"></div>
<script>
const login = document.querySelector("#login");
const info = document.querySelector("#info");
const login_btn = document.querySelector("#login-btn");
const username = document.querySelector("#username");
const password = document.querySelector("#password");
if (localStorage.getItem("token")) {
login.innerHTML = `
<h1>欢迎超级管理员回来</h1>
<hr>
<button id="load-btn">加载数据</button>
<button id="out-btn">注销</button>
`;
} else {
login_btn.addEventListener("click", () => {
fetch("http://localhost:3000/login", {
method: "post",
headers: {
"Content-type": "application/json"
},
body: JSON.stringify({
username: username.value.trim(),
password: password.value.trim()
})
})
.then(res => res.json())
.then(res => {
console.log(res);
if (res.status == "ok") {
info.innerText = "登录成功";
login.innerHTML = `
<h1>欢迎${res.data.nickname}回来</h1>
<hr>
<button id="load-btn">加载数据</button>
<button id="out-btn">注销</button>
`;
localStorage.setItem("token", res.data.token)
localStorage.setItem("nickname", res.data.nickname)
} else {
info.innerText = "用户名或密码错误";
}
})
.catch(err => {
console.log("代码运行出错了");
})
})
}
const loadBtn = document.querySelector("#load-btn");
loadBtn.onclick = function () {
// 读取学生信息
fetch("http://localhost:3000/students", {
headers: {
"Authorization": `Bearer ${localStorage.getItem("token")}`
}
})
.then(res => {
return res.json()
})
.then(res => {
if (res.status === "ok") {
console.log(res);
const table = document.createElement("table");
list.appendChild(table);
table.insertAdjacentHTML("beforeend", "<caption>学生列表</caption>");
for (let item of res.data) {
const tr = document.createElement("tr");
for (let probname in item) {
const td = document.createElement("td");
td.innerText = `${item[probname]}`;
tr.appendChild(td);
}
table.appendChild(tr);
}
}
})
.catch(err => {
console.log("出错了");
})
}
// fetch("http://localhost:3000/students", {
// method: "post",
// headers: {
// "Content-type": "application/json"
// },
// body: JSON.stringify({
// name: "min",
// age: "18",
// gender: "女",
// address: "bupt"
// })
// })
// .then(res => res.json())
// .then(res => console.log(res))
// .catch(err => console.log(err))
</script>
</body>
</html>
- index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id="btn">点我加载数据</button>
<button id="btn2">点我加载数据2</button>
<div id="root">
</div>
</body>
<script>
const btn = document.querySelector("#btn");
const btn2 = document.querySelector("#btn2");
const root = document.querySelector("#root");
btn.addEventListener("click", () => {
fetch("http://localhost:3000/students")
.then(res => {
if (res.status === 200) {
// 获取数据
return res.json()
} else {
throw new Error("加载失败！")
}
})
.then(res => {
if (res.status === "ok") {
const table = document.createElement("table");
root.appendChild(table);
for (let item of res.data) {
const tr = document.createElement("tr");
for (let probname in item) {
const td = document.createElement("td");
td.innerText = `${item[probname]}`;
tr.appendChild(td);
}
table.appendChild(tr);
}
}
})
.catch(err => {
console.log("出错了");
})
})
btn2.onclick = function(){
fetch("http://localhost:3000/students/1", {
method:"delete",
headers:{
"Content-type":"application/json"
},
body:JSON.stringify({
})
})
}
</script>
</html>