内容简介：ajax小test
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>AJAX DEMO</title>
<style>
*{margin: 0;padding: 0;box-sizing: border-box;}
ol{list-style: none;}
#container img{width: 150px;}
#container {display: flex;justify-content: center;flex-wrap: wrap;max-width: 800px;}
</style>
</head>
<body>
<button id="btn">加载</button>
<ol id="container"></ol>
<script>
let page = 1;
let btn = document.getElementById("btn");
let con = document.getElementById("container");
btn.onclick = function () {
let req = new XMLHttpRequest();
req.open("GET","/page"+page+".json");
req.onload = function () {
page += 1;
let object = JSON.parse(req.responseText);
console.log(object)
let nextPage = object.hasNextPage;
console.log(nextPage);
if(!nextPage){
btn.disabled = true;
}
let array = object.items;
array.forEach(function (item,index) {
let li = document.createElement("li");
let img = document.createElement("img");
li.appendChild(img);
img.src=item.url;
con.appendChild(li);
})
}
req.send();
}
</script>
</body>
</html>
var http = require('http')
var fs = require('fs')
var url = require('url')
//console.log(Object.keys(http))
var port = process.env.PORT || 8888;
var server = http.createServer(function(request, response){
var temp = url.parse(request.url, true)
var path = temp.pathname
var query = temp.query
var method = request.method
//从这里开始看，上面不要看
if(path === '/'){ // 如果用户请求的是 / 路径
var string = fs.readFileSync('./index.html')
response.setHeader('Content-Type', 'text/html;charset=utf-8')
response.end(string)
}else if(path === '/signUp' && method === 'POST'){
getPostData(request, function(postData){
let errors = checkPostData(postData)
if(Object.keys(errors).length === 0){
let {email, password} = postData
let user = {
email: email,
passwordHash: frankHash(password) // 永远不要使用 MDN5，永远不要自己发明加密算法
}
// 写数据库
let dbString = fs.readFileSync('./db.json', 'utf-8')
let dbObject = JSON.parse(dbString)
dbObject.users.push(user)
let dbString2 = JSON.stringify(dbObject)
fs.writeFileSync('./db.json',dbString2, {encoding: 'utf-8'})
}else{
response.statusCode = 400
}
response.setHeader('Content-Type', 'text/html;charset=utf-8')
response.end(JSON.stringify(errors)) // 运行在node.js
})
}else if(path === '/node_modules/jquery/dist/jquery.min.js'){
let string = fs.readFileSync('./node_modules/jquery/dist/jquery.min.js')
response.setHeader('Content-Type', 'application/javascript;charset=utf-8')
response.end(string)
}else if(path === '/main.js'){
let string = fs.readFileSync('./main.js')
response.setHeader('Content-Type', 'application/javascript;charset=utf-8')
response.end(string)
}else if(path === '/home'){
var cookies = parseCookies(request.headers.cookie);
response.setHeader('Content-Type', 'text/html;charset=utf-8')
if(cookies.logined === 'true'){
response.end(`{cookies.user_id}已登录`)
}else{
let string = fs.readFileSync('./home')
response.end(string)
}
}else if(path === '/login' && method === 'POST'){
// 读数据库
getPostData(request, (postData)=>{
let dbString = fs.readFileSync('./db.json', 'utf-8')
let dbObject = JSON.parse(dbString)
let users = dbObject.users
let {email, password} = postData
let found
for( var i=0; i< users.length; i++){
if(users[i].email === email && users[i].passwordHash === frankHash(password)){
found = users[i]
break
}
}
if(found){
// 标记该用户登录了
response.setHeader('Set-Cookie', ['logined=true; expires=1000; path=/;', 'user_id='+email+'; expires=123456789; path=/;'])
response.end('')
}else{
response.statusCode = 400
let errors = {email: '没有注册或密码错误'}
response.setHeader('Content-Type', 'text/html;charset=utf-8')
response.end(JSON.stringify(errors))
}
})
}else if(path === "/page1.json"){
let string = fs.readFileSync("./page1.json");
response.setHeader("content-type","application/json");
response.end(string);
}else if(path === "/page2.json"){
let string = fs.readFileSync("./page2.json");
response.setHeader("content-type","application/json");
response.end(string);}
else if(path === "/page3.json"){
let string = fs.readFileSync("./page3.json");
response.setHeader("content-type","application/json");
response.end(string);}
else if(path === "/page4.json"){
let string = fs.readFileSync("./page4.json");
response.setHeader("content-type","application/json");
response.end(string);}
else if(path === "/page5.json"){
let string = fs.readFileSync("./page5.json");
response.setHeader("content-type","application/json");
response.end(string);}
else{
response.statusCode = 404
response.setHeader('Content-Type', 'text/html;charset=utf-8')
response.end('找不到对应的路径，你需要自行修改 index.js')
}
// 代码结束，下面不要看
console.log(method + ' ' + request.url)
})
function getPostData(request, callback){
data = ''
request.on('data', (postData) => {
data += postData.toString()
})
request.on('end', () => {
let array = data.split('&')
let postData = {}
for(var i=0; i<array.length; i++){
let parts = array[i].split('=')
let key = decodeURIComponent(parts[0])
let value = decodeURIComponent(parts[1])
postData[key] = value
}
callback.call(null, postData)
})
}
function checkPostData(postData){
let {email, password, password_confirmation} = postData
let errors = {}
// check email
if(email.indexOf('@') <= 0){
errors.email = '邮箱不合法'
}
if(password.length < 6){
errors.password = '密码太短'
}
if(password_confirmation !== password){
errors.password_confirmation = '两次输入密码不匹配'
}
return errors
}
function frankHash(string){
return 'frank' + string + 'frank'
}
function parseCookies(cookie) { // JSON.parse
try{
return cookie.split(';').reduce(
function(prev, curr) {
var m = / *([^=]+)=(.*)/.exec(curr);
var key = m[1];
var value = decodeURIComponent(m[2]);
prev[key] = value;
return prev;
},
{ }
);
}catch(error){
return {}
}
}
function stringifyCookies(cookies) { //JSON.stringify
var list = [ ];
for (var key in cookies) {
list.push(key + '=' + encodeURIComponent(cookies[key]));
}
return list.join('; ');
}
server.listen(port)
console.log('监听 ' + port + ' 成功，请用在空中转体720度然后用电饭煲打开 http://localhost:' + port)
{
"items": [
{
"url": "https://img3.doubanio.com/icon/ul1856810-26.jpg"
},
{
"url": "https://img3.doubanio.com/icon/ul1856810-26.jpg"
},
{
"url": "https://img3.doubanio.com/icon/ul1856810-26.jpg"
},
{
"url": "https://img3.doubanio.com/icon/ul1856810-26.jpg"
},
{
"url": "https://img3.doubanio.com/icon/ul1856810-26.jpg"
}
],
"hasNextPage":false
}
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