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JSON you don’t know much about

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2020-06-13 09:43:51 2382browse

Preface


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


  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


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


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 you don’t know much about

##JSON Native support

Native JSON objects are supported by the following browsers.

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

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