JavaScript中函数与对象的三种创建方式详解

function calSum1(num1, num2) {
   return num1 + num2;
}
console.log(calSum1(10, 10));

var calSum2 = function (num1, num2) {
  return num1 + num2;
}
console.log(calSum2(10, 20));

var calSum3 = new Function('num1', 'num2', 'return num1 + num2');
console.log(calSum3(10, 30));

var Student1 = {
  name: 'xiaofang',   // 对象中的属性
  age: 18,
  sex: 'male',
  sayHello: function () {
    console.log('hello,我是字面量对象中的方法');
  },
  doHomeword: function () {
    console.log("我正在做作业");
  }
};
console.log(Student1);
console.log(Student1.name);
Student1.sayHello();

function createStudent(name, age, sex) {
  var Student = new Object();
  Student.name = name;
  Student.age = age;
  Student.sex = sex;
  Student.sayHello = function () {
    console.log("hello, 我是工厂模式创建的对象中的方法");
  }
  return Student;
}
var student2 = createStudent('小红', 19, 'female');
console.log(student2);
console.log(student2.name);
student2.sayHello();

    function Student (name, age, sex) {
      this.name = name;
      this.age = age;
      this.sex = sex;
      this.sayHello = function () {
        console.log("hello, 我是利用构造函数创建的对象中的方法");
      }
    }
    var student3 = new Student('小明', 20, 'male');
    console.log(student3);
    console.log(student3.name);
    student3.sayHello();