闪亮应用程序中`js`中变量名中的点

var person = {
  name: "John",
  age: 30
};

console.log(person.name); // 输出 "John"
person.age = 40; // 修改年龄属性为40
console.log(person.age); // 输出 40

var calculator = {
  add: function(a, b) {
    return a + b;
  },
  subtract: function(a, b) {
    return a - b;
  }
};

console.log(calculator.add(5, 3)); // 输出 8
console.log(calculator.subtract(5, 3)); // 输出 2

var person = {
  name: "John",
  age: 30
};

var variableName = "person.name";
console.log(eval(variableName)); // 输出 "John"