Detailed introduction to json objects in js_javascript skills

1.JSON (JavaScript Object Notation) is a simple data format that is more lightweight than xml. JSON is a native JavaScript format, which means that no special API or toolkit is required to handle JSON data in JavaScript.
The rules of JSON are simple: an object is an unordered collection of "name:value" pairs. An object starts with "{" (left bracket) and ends with "}" (right bracket). Each "name" is followed by a ":" (colon); "name/value" pairs are separated by "," (comma).

The rules are as follows:

1) Mapping is represented by colon (":"). Name:value
2) Parallel data are separated by commas (","). Name 1: Value 1, Name 2: Value 2
3) The mapped collection (object) is represented by curly brackets ("{}"). {Name1:Value1,Name2:Value2}
4) The collection (array) of parallel data is represented by square brackets ("[]").
[
{name1:value,name2:value2},

{name1:value, name2:value2}

]
5) The types that element values ​​can have: string, number, object, array, true, false, null

Five writing methods in 2.json:

1) Traditional way of storing data and calling data

Copy code The code is as follows:

2) The first style:

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3) Second style:

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4) The third style:

Copy code The code is as follows:

5) The fourth style:

Copy code The code is as follows:

6) The fifth style:

Copy code The code is as follows: