a.js
this is node to export a class
let Person = function () {
this.name = ";}
Person.prototype = {
constructor:Person,
say:function () {
console.log("my name is "+this.name);
}};
module.exports.Person = Person;
b.js
reference a.js file
let Person = require (". / a.js");
let person = new Person ("Zhang San");
console.log (person.say ());
Why did you finally output my name is Zhang San and undefined
person.say () is a method that does not return anything
you console.log directly (person.say ()) is undefined of course
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