Promise Encapsulation Node read-write function __node

The most recent way to implement mock virtual data through node is to use the FS module of node to read and write to our local files to achieve a mock function:

We can develop a JS file that specializes in encapsulating a simple file-reading function.

The JS code is as follows:

Let FS = require (' FS '); Let DEALFN = {/** * [write Data via promise] * @param {String} file [FileName] * @param {object} obj [written data (object)] * @return      {Object}
	        [Promise Object] * * Writefiledata: (filename, obj) => {Let promise = new Promise ((Resolve, reject) => {
	        obj = json.stringify (obj);
	            Fs.writefile ("./data/" + filename, obj, function (err) {if (err) {Reject ("fail" + Err)
	            else {Resolve ("write success!");
	    }
	        });
	}) return promise; },/** * [read stored data through promise] * @param {String} file [FileName] * @return {object} [Promise objects]/readfiledata: (filename) => {Let promise = new promise (Resolve, Reject) => {fs.readfile ("./data/" + filename, "UT
	                F-8 ", (err, data) => {if (err) {Console.log (err);
	            Reject ("read Filedata error!"); }else {data = JSON. Parse (data);
	            Resolve (data);
	    }
	        })
	    });
	return promise;

}
}; Module.exports = Datafn;

Next we can call the following:

Router.post ('/test.json ', function (req,res,next) {let
  senddata = {message
    : ' OK ',
    data: {}
  };

  Dealfn.readfiledata ('.. /data/test.json '). Then (data=>{
    senddata.data = data;
    Res.status. JSON (SendData);
  }). catch (message=>{
    senddata.errno =-1;
    Senddata.message = ' temporarily no data ';
    Res.status. JSON (SendData);
  })
;