node.js - var vs this in Javascript object -

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i'm developing web framework node.js. here code; 

function router(request, response) {         this.routes = {};          var parse = require('url').parse;          var path = parse(request.url).pathname,             reqroutes = this.routes[request.method],             reqrouteslen = reqroutes.length;          ..... // more code  };

should change var this, so:

function router(request, response) {         this.routes = {};          this.parse = require('url').parse;          this.path = this.parse(request.url).pathname;         this.reqroutes = this.routes[request.method];         this.reqrouteslen = this.reqroutes.length;          ..... // more code  };

any comments?

add properties this when want properties persist life of object in question. use var local variables.

edit — bergi notes in comment, variables declared var don't necessarily vanish upon return function invocation. are, , remain, directly accessible code in scope in declared, , in lexically nested scopes.


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