javascript how to json content

JavaScript is a programming language widely used in web development, and it is also a skill that must be mastered in front-end development work. During the development process, JavaScript can be used to achieve dynamic interactive effects, thereby improving the user experience of the website. Among them, JSON is a special data format that is widely used in JavaScript development. This article will introduce how to process JSON data in JavaScript.

1. What is JSON

The full name of JSON is JavaScript Object Notation, which is a lightweight text-based data exchange format. Data in JSON format can be represented as a JavaScript object, which is similar to the JavaScript object format. Data in JSON format has the following characteristics:

1. Easy to read and write: JSON’s data format is concise and clear, easy to read and write, and convenient for people to exchange data.
2. Compactness: JSON data format is relatively compact, which can improve the efficiency of data transmission.
3. Parsability: The JSON data format can be parsed by most programming languages, making it convenient for developers to process data.

2. JSON processing in JavaScript

JavaScript provides some built-in functions for processing JSON data. Below we will introduce the usage of these functions respectively.

1. JSON.parse() function

The JSON.parse() function is used to convert JSON-formatted strings into JavaScript objects. The syntax is as follows:

JSON.parse(text[,reviver])

Among them, text represents the JSON format string to be parsed, and reviver is an optional parameter, used to process the parsed JavaScript object, which can be a function or a filter array.

Example:

var jsonStr = '{"name": "张三", "age":20}';
var jsonObj = JSON.parse(jsonStr);
console.log(jsonObj.name); //输出 "张三"
console.log(jsonObj.age); //输出 20

2. JSON.stringify() function

The JSON.stringify() function is used to convert JavaScript objects into JSON format characters string. The syntax is as follows:

JSON.stringify(value[,replacer[,space]])

Among them, value represents the JavaScript object to be converted into a JSON format string, replacer is an optional parameter, used to control the converted result, which can be a function or an array, and space is Optional parameter that specifies the number of whitespace characters to indent the result string.

Example:

var jsonObj = {"name":"张三","age":20};
var jsonStr = JSON.stringify(jsonObj);
console.log(jsonStr); //"{"name":"张三","age":20}"

3. The JSON.stringify() function and the JSON.parse() function are used together

When needed between different web pages When passing a JavaScript object, you can convert the object into a JSON format string, and then convert the JSON format string into a JavaScript object after transmission. An example is as follows:

//将 对象转化为JSON格式字符串
var jsonObj = {"name":"张三","age":20};
var jsonStr = JSON.stringify(jsonObj);

//传输jsonStr之后

//将JSON格式字符串转化为对象
var jsonObjNew = JSON.parse(jsonStr);
console.log(jsonObjNew.name); //输出 "张三"
console.log(jsonObjNew.age); //输出 20

The above is the relevant introduction to processing JSON format data in JavaScript. I hope it will be helpful to your work.

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