Demo
Registration effect:
Landing effect:
Database:
Database operations
Db.js
/ / This module encapsulates all the common operations on the database
Var MongoClient = require(‘mongodb‘).MongoClient;
Var settings = require("../settings.js");
/ / Regardless of the operation of the database, are the first to connect to the database, so we can connect to the database
/ / Encapsulation becomes an internal function
Function _connectDB(callback) {
Var url = settings.dburl; //from the settings file, all database addresses
//Connect to the database
MongoClient.connect(url, function (err, db) {
If (err) {
Callback(err, null);
Return;
}
Callback(err, db);
});
}
/ / Insert data
exports.insertOne = function (collectionName, json, callback) {
_connectDB(function (err, db) {
Db.collection(collectionName).insertOne(json, function (err, result) {
Callback(err, result);
Db.close (); / / close the database
})
})
};
// Find the data and find all the data. Args is an object {"pageamount":10,"page":10}
Exports.find = function (collectionName, json, C, D) {
Var result = []; // result array
If (arguments.length == 3) {
// Then the parameter C is the callback, and the parameter D is not passed.
Var callback = C;
Var skipnumber = 0;
//number limit
Var limit = 0;
} else if (arguments.length == 4) {
Var callback = D;
Var args = C;
//The number of bars that should be omitted
Var skipnumber = args.pageamount * args.page || 0;
//number limit
Var limit = args.pageamount || 0;
//Sort by
Var sort = args.sort || {};
} else {
Throw new Error("The number of arguments to the find function must be 3, or 4.");
Return;
}
/ / Connect to the database, find all after the connection
_connectDB(function (err, db) {
Var cursor = db.collection(collectionName).find(json).skip(skipnumber).limit(limit).sort(sort);
Cursor.each(function (err, doc) {
If (err) {
Callback(err, null);
Db.close (); / / close the database
Return;
}
If (doc != null) {
Result.push(doc); //put the result array
} else {
//The traversal is over, there are no more documents.
Callback(null, result);
Db.close (); / / close the database
}
});
});
}
//delete
exports.deleteMany = function (collectionName, json, callback) {
_connectDB(function (err, db) {
//delete
Db.collection(collectionName).deleteMany(
Json,
Function (err, results) {
Callback(err, results);
Db.close (); / / close the database
}
);
});
}
//modify
exports.updateMany = function (collectionName, json1, json2, callback) {
_connectDB(function (err, db) {
Db.collection(collectionName).updateMany(
Json1,
Json2,
Function (err, results) {
Callback(err, results);
Db.close();
});
})
}
exports.getAllCount = function (collectionName,callback) {
_connectDB(function (err, db) {
Db.collection(collectionName).count({}).then(function(count) {
Callback(count);
Db.close();
});
})
}
Password encryption:
var crypto = require("crypto"); module.exports = function(mingma){ var md5 = crypto.createHash(‘md5‘); var password = md5.update(mingma).digest(‘base64‘); return password; }
Template:
Login.ejs
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>Please login</h1>
<div>
<form action="" method="post">
<p>
Login name: <input type="text" id="dengluming"/>
</p>
<p>
Password: <input type="password" id="mima"/>
</p>
<p>
<input id="denglu" type="button" value="Login"/>
</p>
</form>
</div>
<script type="text/javascript" src="/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
/ / Use ajax to submit the form
$("#denglu").click(function(){
$.post("/dologin",{
"dengluming" : $("#dengluming").val(),
"mima" : $("#mima").val()
},function(result){
If(result == "1"){
Alert ("Login successful");
}else if(result == "-2"){
Alert ("There is no such registered user");
}else if(result == "-1"){
Alert ("Password is incorrect");
}
})
});
</script>
</body>
</html>
regist.ejs
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div>
<p>
Login name: <input type="text" name="dengluming" id="dengluming"/>
</p>
<p>
Password: <input type="password" name="mima" id="mima"/>
</p>
<p>
<input id="zhuce" type="button" value="Register"/>
</p>
</div>
<script type="text/javascript" src="/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
/ / Use ajax to submit the form
$("#zhuce").click(function(){
$.get("/doregist",{
"dengluming" : $("#dengluming").val(),
"mima" : $("#mima").val()
},function(result){
If(result == "1"){
Alert ("registration succeeded");
}else{
Alert ("registration failed");
}
})
});
</script>
</body>
</html>
sign up:
Var express = require("express");
Var app = express();
Var formidable = require(‘formidable‘);
Var db = require("./model/db.js");
Var md5 = require("./model/md5.js");
App.set("view engine","ejs");
App.use(express.static("./public"));
//registration page
App.get("/regist",function(res,res,next){
Res.render("regist");
});
//login page
App.get("/login",function(res,res,next){
Res.render("login");
});
//Execute registration
App.get("/doregist",function(req,res,next){
Var dengluming = req.query.dengluming;
Var mima = req.query.mima;
//encryption
Mima = md5(md5(mima).substr(4,7) + md5(mima));
/ / Save the username and password in the database
db.insertOne("users",{
"dengluming" : dengluming,
"mima" : mima
},function(err,result){
If(err){
Res.send("-1");
Return;
}
Res.send("1");
})
});
App.post("/dologin",function(req,res,next){
Var form = new formidable.IncomingForm();
Form.parse(req, function(err, fields, files) {
Var dengluming = fields.dengluming;
Var mima = fields.mima;
Mima = md5(md5(mima).substr(4,7) + md5(mima));
/ / Retrieve the database, retrieve the database by login name, check whether the password matches
Db.find("users",{"dengluming":dengluming},function(err,result){
If(result.length == 0){
Res.send("-2"); //-2 no such person
Return;
}
Var shujukuzhongdemima = result[0].mima;
// To perform the same encryption operation on the password entered by the user this time. Then with
/ / Database password comparison
If(mima == shujukuzhongdemima){
Res.send("1"); //Success
}else{
Res.send("-1"); //Password does not match
}
});
});
Return;
});
App.listen(3000);
Database address:
Settings.js
module.exports = {
"dburl" : "mongodb://localhost:27017/day7"
}
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