nodejs express allows spanning settings

In order to simulate sending requests to the background, you need to build a demo of the web project, and use the express of nodejs to simulate the web project

 

var express = require("express");
var http = require("http");
var app = express ();

///////////////////// Get the data from the post////////////////////// //////
var bodyParser = require("body-parser");
app.use(bodyParser.urlencoded({ extended: false }));

///////////////////////////////////////////////////////////////// ///
var ejs = require("ejs");
//Use the set method to specify values ​​for the system variables "views" and "view engine".
app.set("views", __dirname + "/views");
// Specify the suffix of the template file as html
app.set('view engine', 'html');
// run the hbs module
app.engine('html', ejs.__express);

////////////////////////////////////////////////////////////////////////////////////////// /////////
var router = express.Router();
var router1 =  require('./routes/router1');
var router2 =  require('./routes/router2');
var router3 =  require('./routes/router3');
var testRouter =  require('./routes/test/test');
var sqhIndex =  require('./routes/sqh/sqhIndex');
var klwIndex =  require('./routes/klw/klwIndex');


//Set the root directory of the web project
app.use(express.static(__dirname + '/'));

// allow cross domain
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
    res.header("X-Powered-By",' 3.2.1')
    if(req.method=="OPTIONS") res.send(200);/*Let the options request return quickly*/
    else  next();
});


app.use('/router1', router1);
app.use('/router2', router2);
app.use('/router3', router3);
app.use('/test', testRouter);
app.use('/sqh', sqhIndex);
app.use('/klw', klwIndex);


http.createServer(app).listen(3000);

 

Note: You need to put the request code that allows cross-domain in front of all routes , because when the request is accepted by express, the order of interception is determined according to the routing order of the code written by yourself . Once the interception conditions are met, if you do not execute next( ) method, the request will not be sent to the next route interceptor.