节点 js 应用程序中的弃用警告

Posted 2023-03-10

???????? js ??????????

??????:DeprecationWarnings in nodejs application

??????:2020-03-08 06:58:07

??????:

????.js

const express=require('express')
const router=express.Router()
const gravatar=require('gravatar')
const bcrypt=require('bcryptjs')
const check,validationResult =require('express-validator/check')

const User=require('../../models/User')

//@route  POST api/users
//@desc   Register user
//@access public
router.post('/',[
check('name','Name is required').not().isEmpty(),
check('email','please include a valid email').isEmail(),
check('password','please enter password with more than 6 characters').isLength(min:6)
],async(req,res)=>
const errors=validationResult(req);
if(!errors.isEmpty())
    return res.status(400).json(errors:errors.array())


const name,email,password=req.body;

try
 //see if the user exists
let user = await User.findOne( email: email )

//if record exists in DB
if (user) 
    return res.status(400).json( errors: [ msg: "user already exists" ] );


 //get users gravatar
 const avatar=gravatar.url(email,
     s:'200', //size
     r:'pg',  //rating of image
     d:'mm'   //gives a default image
 )
user=new User(
    name,
    email,
    avatar,
    password
)
 //encrpyt password 
 const salt=await bcrypt.genSalt(10) // 10-no of rounds.more the better

 user.password=await bcrypt.hash(password,salt); //coverts to hash pass

 await user.save();

 //return jsonwebtoken

 res.send('User registered')
catch(e)
    console.log(e.message)
    res.status(500).send('server error')


res.send('User route')
)

module.exports=router;

????????,?????????

(node:1022) UnhandledPromiseRejectionWarning: ?? [ERR_HTTP_HEADERS_SENT]: ????????????? ? ServerResponse.setHeader (_http_outgoing.js:464:11) ? ServerResponse.header (/Users/udayshetty/Desktop/MERN app/node_modules/express/lib/response.js:771:10) ? ServerResponse.send (/Users/udayshetty/Desktop/MERN app/node_modules/express/lib/response.js:170:12) ? /Users/udayshetty/Desktop/MERN app/routes/api/users.js:60:9 ? processTicksAndRejections (internal/process/task_queues.js:85:5) (node:1022) UnhandledPromiseRejectionWarning:????????????????? catch ?????????????,?????? .catch() ?????? (????:1) (??:1022)[DEP0018] DeprecationWarning:????????????????,???? Promise ????????????? Node.js ???

??????:

?????res.send('User route'),?????????????????,???????

users.js ??? 60 ?? res.send('User route'),???????

???????

Error: Can't set headers after they are sent to the client?????

?????1?:

??????? HTTP ????????????????/?????,?????????????,???????????? http ??,????????????????????????,????????????

????? res.send('User route')?

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