How to access the value of a property in a JSON object?

To access the property values of a JSON object, you can use either a dot notation or square brackets to access the properties.

For example, let’s say we have the following JSON object:

{
  "name": "John",
  "age": 30,
  "city": "New York"
}

To obtain the value of the name attribute, you can use the following method:

1. The name property of the jsonObject.
2. the key “name” in the jsonObject

Example code:

let jsonObject = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

console.log(jsonObject.name); // 输出: John
console.log(jsonObject["name"]); // 输出: John

Both dot and bracket notation can be used to access properties of a JSON object. However, the advantage of using bracket notation is the ability to use variables or dynamic expressions as property names. For example:

let propertyName = "name";
console.log(jsonObject[propertyName]); // 输出: John

This allows for dynamically retrieving the value of a property based on the value of a variable.