我试图从javascript对象中检索“员工信息”，但是在检查javascript控制台时出错

Question

 // the Employee object function Employee( name, email, role ) { this.name = name; this.email = email; this.role = role; } Employee.prototype.helloEmployee = function() { console.log( "Oye" + role); } // the emp object inherits from Employee function emp( name, email ) { Employee.call(this, name, email, "admin"); } emp.prototype = Object.create( Employee.prototype ); var kumar = new emp( "Kumar", "info@helloitskumar.com" ); kumar.helloEmployee(); 

我试图从javascript对象检索employee info ，但在检查javascript控制台时出错。 您能帮我解决代码问题吗？

Answer 1

您忘记在console.log中添加this参考。 检查这个工作的jsfiddle

 // the Employee object function Employee( name, email, role ) { this.name = name; this.email = email; this.role = role; } Employee.prototype.helloEmployee = function() { console.log( "Oye" + this.role); } // the emp object inherits from Employee function emp( name, email ) { Employee.call(this, name, email, "admin"); } emp.prototype = Object.create( Employee.prototype ); var kumar = new emp( "Kumar", "info@helloitskumar.com" ); kumar.helloEmployee();