JSON you don’t know much about

Preface

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Although the probability of being asked about this knowledge point in the interview is very low, it may still be asked.

The reason why JSON is popular

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1. Has a syntax similar to js

2. You can JSON data structure is parsed into js objects

3. Compared with XML data structure, extracting data is simpler

JSON syntax

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Simple value

1. String=>“123”

2. Value= >123

3. Boolean=>true

4. ##null

Object

{"name": "helin","age": 12}

Array

[ {"name": " iskeeping","age": 12} ]

Note: The JSON key must use double quotes, and if the value is a string, it must also use double quotes.

JSON parsing method

1. Use eval

eval("({\"name\":\"iskeeping\"})")

2. Use Functionnew

Function("", "return ({\"name\":\"iskeeping\"})")()

3. Use JSON.parse

JSON.parse("{\"name\":\"iskeeping\"}")

JSON serialization

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let json = simple value/object/array

JSON.stringify(json,null/[]/function(key,value) {}, indent space length/string)

Example:

let formateJson = JSON.stringify({ name: "iskeeping", age: 12 }, function (key, value) {
    switch (key) {
        case "name": return "iskeepingxx";
        default: return value;
    }
}, 8)
cosnole.log(formateJson)

Output formatJson as shown below:

##JSON Native support

Native JSON objects are supported by the following browsers.

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IE8, Firefox3.5, Safari 4, Opera 10.5 and chrome

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