关于NodeJs模块调用

1、fun.js

function Say() {
    var name;
    this.setName = function(username) {
        name = username;
    };
    
  this.sayHello = function() {
        console.log('hi, ' + name);
    };
};
module.exports = Say;

2、demo.js

var Say = require('./func');
say = new Say();
say.setName('jzh');
say.sayHello();