The code of .then ((data) {}) in vue.js,axios does not understand.

Line 50. The code after that is not very good at writing (ignored by URL in line 43). I read that many people"s are different and did not write comments, so please give me some guidance. Thank you. One more question: what do you mean by three data together (for example: data.data.data)

Apr.23,2022

The data in

.then ((data) = > {}) refers to the data returned by the API successfully, including request header, request body, and other information.
you can print this data. The obj of our success (obj) {} in jquery is similar to the data.data
here. The then () method here has two parameters. The first is the callback method on success, which passes success data to this method by default.
the other is the failed method and the failed data. The second is optional,
then (function (obj) {

)

}, function (err) {

})
Arrow function is
then ((data) = > {

)

})
the second parameter is omitted.
in general, in order not to report an error, catch (e) {
/ / similar to try {} catch (e) {} you can understand that try ()
}

is omitted.

. Then (data = > {}) this data is the result of your request for url.


data after

then is the response data obtained after your AJAX request

const data = {
    data: {
        data: 1
    }
}

so the value of data.data.data is 1


.then (data = > {}) takes the value returned by axios as the callback function parameter of the then () method, that is, data ,
data.data.data indicates wrapping two-tier objects, both of which are called data , and the last data is the attribute name


.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3d8bc-3476b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3d8bc-3476b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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