node. JS gets Get/post data

goal : Use node. js to build a simple server to provide a simple interface that achieves two digital subtraction calculations and returns JSON results. (General Get/post)

Knowledge points

1. Get Get Data
2. Get Post Data
3. Understanding Listener Events

实现

var http = require ("http");            Provide the Web service var URL = require ("url");    Parse GET request var query = require ("querystring"); Parse POST request//service var server = function (request,response) {//define header Response.writehead (200,{"Content-type": "Text/json"}    );        The judgment is Get/post request if (Request.method = = "GET") {var params = [];        params = Url.parse (request.url,true). query;        params[' fruit '] = compute (params);        Response.Write (Json.stringify (params));    Response.End ();        }else{var postdata = "";        Request.addlistener ("Data", function (postchunk) {postdata + = Postchunk;            })//post End output Request.addlistener ("End", function () {var params = Query.parse (postdata);            params[' fruit '] = compute (params);            Response.Write (Json.stringify (params));        Response.End (); })}}//COMPUTE var compute = function (params) {switch (params[' type ')} {case "add": Return parsefloat (params[' num ')]) + parsefloat (params[' num1 ');        Case "Subtract": Return parsefloat (params[' num '))-parsefloat (params[' num1 ']);        Case "multiplication": Return parsefloat (params[' num ') * parsefloat (params[' num1 ']);    Case "Division": Return parsefloat (params[' num ')/parsefloat (params[' num1 ']);  }}//opens the service at 127.0.0.1:8080http.createserver (server). Listen (8080);   Console.log ("Server start!");

It is important to note that because the post quality is too large, the data cannot be taken directly as a GET request. It is necessary to increase the listener event and not end the reply (response) to complete the message flow until the end of the post, so put the output and end to the listener end event.

Test

Get:http://127.0.0.1:8080/?num=32&num1=13&type=add
print {"num": "+", "NUM1": "+", "type": "Add", "Fruit": 45}

POST:
I tested the post using the Chrome plugin postman, which, of course, was a test get request. It contains all request types (delete, put, copy, patch, lock, etc.)

node. JS gets Get/post data