javascript - Get json data from mysql, how does the front end process the conversion and parse the json type

Question

console.log prompts like this:

data: '{"site_name":"aaaa","site_keywords":"bbbb","site_beian":"闽ICP备8888888888号","site_description":"ccccc","site_statistic":"<a>wsdfadfasdfasdfasdfasdf</a>"}',

Obtaining json data from mysql, this problem occurs. How does the front end handle the conversion and parsing of the json type?

Answer 1

Convert String to JSON object :

1    var res = JSON.parse(data); 
or
2    var res = data.parseJSON();
or
3    var res = eval('('+ data +')');

Answer 2

Use JSON.stringify() to convert into a string for subsequent use.

Answer 3

Try to use JSON.parse, eval is not recommended;
Try to add try...catch, the probability of errors when converting JSON to objects is quite high, such as unescaped characters and too many nesting levels;

try{

var myObject = JSON.parse(data);

} catch(e){

console.log(e);

}

Answer 4

The backend sets the Content-Type of the response header to application/json, and the data outputs a string in json format. The frontend automatically obtains the JSON object, which can be processed as an ordinary js object.

Answer 5

var data=[{"site_name":"aaaa","site_keywords":"bbbb","site_beian":"闽ICP备8888888888号","site_description":"ccccc","site_statistic":"<a>wsdfadfasdfasdfasdfasdf</a>"}];

console.log(JSON.stringify(data));