How to get the attributes and values ​​of json object?

JSON (JavaScript Object Notation) is a lightweight data exchange format. Easy for humans to read and write. It is also easy for machines to parse and generate. It is based on a subset of JavaScript (Standard ECMA-262 3rd Edition - December 1999). JSON uses a completely language-independent text format, but also uses conventions similar to the C language family (including C, C, C#, Java, JavaScript, Perl, Python, etc.). These properties make JSON an ideal data exchange language.

The following describes how to obtain JSON attributes and values:

Method 1: Use for in to traverse

1. Use for in to traverse to obtain attributes

var myObj = { "name":"runoob", "alexa":10000, "site":null };
for (x in myObj) { console.log(x); }

Output:

2. Use for in to traverse to obtain Attribute value

var myObj = { "name":"runoob", "alexa":10000, "site":null };
for (x in myObj) {
console.log(myObj[x]);
}

Output:

Note: When using for traversal, the value of the corresponding attribute can only be obtained through myObj[x] , instead of using myObj.x

Method 2: Use the dot (.), which is the form of object name.property name to access

var myObj = { "name":"runoob", "alexa":10000, "site":null };
console.log(myObj.name);

Output:

Method 3: Use square brackets ([]), that is, dictionary indexing to access

var myObj = { "name":"runoob", "alexa":10000, "site":null };
console.log(myObj['name']);  // 输出的是 name 值

Output:

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