// 引用expess框架const express = require('express');// 处理路径const path = require('path');const bodyParser = require('body-parser');// 创建网站服务器const app = express();app.use(bodyParser.json());app.get('/first', (req, res) => {res.send('hello geyao')})app.get('/responsdate', (req, res) => {res.send({ "name": "geyao" })})app.post('/post', (req, res) => {res.send(req.body);})app.get('/get', (req, res) => {res.send(req.query);})app.post('/json', (req, res) => {res.send(req.body);})app.get('/readystate', (req, res) => {res.send('hello');})app.use(express.static(path.join(__dirname)));// 监听端口app.listen(3000);console.log('网站服务器启动成功, 请访问localhost')
ajax5.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><script>var xhr = new XMLHttpRequest();console.log(xhr.readyState);xhr.open('get', 'http://localhost:3000/readystate');console.log(xhr.readyState);xhr.onreadystatechange = function() {console.log(xhr.readyState);//if (xhr.readyState == 4) {console.log(xhr.responseText);}}xhr.send();</script></body></html>
运行结果
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