HereIsJade/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>AJAX demo</title>
</head>
<body>
  <button id="btn">Click to make an HTTP request</button>
  <script>
    btn.addEventListener('click',()=>{
    	let request = new XMLHttpRequest()
      request.open('GET', 'http://jack.com:8002/abc')
      request.onreadystatechange = ()=>{
    		if(request.readyState === 4){
    			console.log("response received")
			    if(request.status >= 200 && request.status < 300){
				    let obj = JSON.parse(request.responseText)
				    console.log(obj)
          }
          else{
    				console.log("failed to make the request")
          }
        }
      }
      request.send()
    })
  </script>
</body>
</html>

## server.js
let http = require('http')
let fs = require('fs')
let url = require('url')
let port = process.argv[2]

if(!port){
	console.log('Please specify a port number\nExample: node server.js 8888')
	process.exit(1)
}

let server = http.createServer(function(request, response){
  let parsedUrl = url.parse(request.url, true)
  let pathWithQuery = request.url
  let queryString = ''
  if(pathWithQuery.indexOf('?') >= 0){ queryString = pathWithQuery.substring(pathWithQuery.indexOf('?')) }
  let path = parsedUrl.pathname
  let query = parsedUrl.query
  let method = request.method

  console.log('HTTP path is\n' + pathWithQuery)

  if(path === '/'){
    let HTMLstring = fs.readFileSync('./index.html', 'utf-8')
    response.statusCode = 200
    response.setHeader('Content-Type', 'text/html;charset=utf-8')
    response.write(HTMLstring)
    response.end()
  }
  else if(path === '/abc'){
    response.setHeader('Content-Type', 'text/json;charset=utf-8')
    response.setHeader('Access-Control-Allow-Origin', '*')
    response.statusCode = 200
    response.write(`{"name": "Jade", "age": 18}`)
    response.end()
  }
  else{
    response.statusCode = 404
    response.setHeader('Content-Type', 'text/html;charset=utf-8')
    response.write('404 not found')
    response.end()
  }

})

server.listen(port)
console.log('Listening on ' + port + ' success\nPlease visit http://localhost:' + port)
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>AJAX demo</title>
	</head>
	<body>
	<button id="btn">Click to make an HTTP request</button>
	<script>
	btn.addEventListener('click',()=>{
	let request = new XMLHttpRequest()
	request.open('GET', 'http://jack.com:8002/abc')
	request.onreadystatechange = ()=>{
	if(request.readyState === 4){
	console.log("response received")
	if(request.status >= 200 && request.status < 300){
	let obj = JSON.parse(request.responseText)
	console.log(obj)
	}
	else{
	console.log("failed to make the request")
	}
	}
	}
	request.send()
	})
	</script>
	</body>
	</html>
	let http = require('http')
	let fs = require('fs')
	let url = require('url')
	let port = process.argv[2]

	if(!port){
	console.log('Please specify a port number\nExample: node server.js 8888')
	process.exit(1)
	}

	let server = http.createServer(function(request, response){
	let parsedUrl = url.parse(request.url, true)
	let pathWithQuery = request.url
	let queryString = ''
	if(pathWithQuery.indexOf('?') >= 0){ queryString = pathWithQuery.substring(pathWithQuery.indexOf('?')) }
	let path = parsedUrl.pathname
	let query = parsedUrl.query
	let method = request.method

	console.log('HTTP path is\n' + pathWithQuery)

	if(path === '/'){
	let HTMLstring = fs.readFileSync('./index.html', 'utf-8')
	response.statusCode = 200
	response.setHeader('Content-Type', 'text/html;charset=utf-8')
	response.write(HTMLstring)
	response.end()
	}
	else if(path === '/abc'){
	response.setHeader('Content-Type', 'text/json;charset=utf-8')
	response.setHeader('Access-Control-Allow-Origin', '*')
	response.statusCode = 200
	response.write(`{"name": "Jade", "age": 18}`)
	response.end()
	}
	else{
	response.statusCode = 404
	response.setHeader('Content-Type', 'text/html;charset=utf-8')
	response.write('404 not found')
	response.end()
	}

	})

	server.listen(port)
	console.log('Listening on ' + port + ' success\nPlease visit http://localhost:' + port)