nodejs实现前后端传值的方法如下：
1、使用GET方式实现前后端数据提交：
GET方式数据放在url里进行提交，容量有限，有缓存
//GET表单.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form action="http://localhost:8080/aaa" method="get">
用户：<input type="text" name="user"><br>
密码：<input type="password" name="pwd"><br>
<input type="submit" value="submit">
</form>
</body>
</html>Node服务器获取用户名与密码
//get_server.js
const http=require('http');
const url=require('url');
createServer((req,res)=>{
let query=url.parse(req.url, true);
console.log('user:'+query.user+',password:'+query.pwd)
}).listen(8080)url.parse解析的是整个url
url.parse(req.url, true)打印出来的内容：
Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: '?user=123&pwd=2345',
query: { user: '123', pwd: '2345' },
pathname: '/aaa',
path: '/aaa?user=123&pwd=2345',
href: '/aaa?user=123&pwd=2345' }2、使用POST方式实现数据提交：
POST方式数据放在http-body里，容量较大，无缓存
//post表单.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form action="http://localhost:8080/aaa" method="POST">
用户：<input type="text" name="user"><br>
密码：<input type="password" name="pwd"><br>
<input type="submit" value="submit">
</form>
</body>
</html>//post_server.js
const http=require('http')
const querystring=require('querystring')
let server=http.createServer((req,res)=>{
let str='';
req.on('data',data=>{
str+=data;
})
req.on('end',()=>{
let post=querystring.parse(str);
console.log(str,post)
})
res.end()
})
server.listen(8080)例：
简单地登录注册提交与数据校验
//index.html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> <script src="jquery-3.3.1.js"></script> <script src="sub.js"></script> </head> <body> 用户名：<input type="text" id="user"><br> 密 码：<input type="password" id="pwd"><br> <button id="btn1">注册</button> <button id="btn2">登录</button> </body> </html>
//sub.js
$(()=>{
$('#btn1').click(()=>{
$.ajax({
url:'/reg',
type:GET,
data:{user:$('#user').val(),pwd:$('#pwd').val()},
dataType:'json',
success(data){
if(data.err){
alert('错误'+data.msg)
}else{
alert('注册成功')
}
},
error(){
alert('出错了')
}
})
});
$('#btn2').click(()=>{
$.ajax({
url:'/login',
type:GET,
data:{user:$('#user').val(),pwd:$('#pwd').val()},
dataType:'json',
success(data){
if(data.err){
alert('错误'+data.msg)
}else{
alert('登录成功')
}
},
error(){
alert('出错了')
}
})
})
})服务器端数据校验
//server.js
const http=require('http');
const url=require('url');
const querystring=require('querystring');
const fs=require('fs')
let users={
}
let server=http.createServer((req,res)=>{
// GET
let {pathname,query}=url.parse(req.url,true);
// console.log(pathname)
// POST
let str='';
req.on('data',data=>{
str+=data;
})
req.on('end',()=>{
let post=querystring.parse(str)
let {user, pwd}=query;
switch(pathname){
case '/reg': //注册
if(!user){
res.write('{"err":1, "msg":"user is required"')
}else if(!pwd){
res.write('{"err":1, "msg":"pwd is required"}')
}else if(!/^\w{8,32}$/.test(user)){
res.write('{"err":1, "msg":"invaild user"}')
}else if(/^['|"]$/.test(pwd)){
res.write('{"err":1,"msg":"invaild password"}')
}else if(users[user]){
res.write('{"err":1, "msg":"user is existed"}')
}else{
users[user]=pwd;
res.write('{"err":0, "msg":"reg success"}')
}
res.end()
break;
case '/login': //登录
if(!user){
res.write('{"err":1, "msg":"user is required"')
}else if(!pwd){
res.write('{"err":1, "msg":"pwd is required"}')
}else if(!/^\w{8,32}$/.test(user)){
res.write('{"err":1, "msg":"invaild user"}')
}else if(/^['|"]$/.test(pwd)){
res.write('{"err":1,"msg":"invaild pwd"}')
}else if(users[user]!=pwd){
res.write('{"err":1, "msg":"username or password is inaccuracy"}')
}else if(!users[user]){
res.write('{"err":0, "msg":"user is not found"}')
}else{
res.write('{"err":0, "msg":"login success"}')
}
res.end()
break;
default: //其他
fs.readFile(`www${pathname}`,(err,data)=>{
if(err){
res.writeHeader(404);
res.write('not found')
}else{
res.write(data)
}
res.end()
})
}
})
})
server.listen(8080)以上就是如何用nodejs实现前后端传值？的详细内容，更多请关注0133技术站其它相关文章！
