How to access and handle nested objects, arrays, or JSON?

I have a nested data structure containing objects and arrays. How to extract information, i.e. access specific or multiple values ​​(or keys)? For example: vardata={code:42,items:[{id:1,name:'foo'},{id:2,name:'bar'}]}; How to access the name of the second item in items?

P粉864872812 2023-10-09 19:02:22 0  2  647

javascript - js parses multi-layer nested json data, recursive call

It is necessary to process the json data returned by the interface and convert it into a data format that Easyui Tree can receive. How to process multi-layer json data. The size of the json data returned is not necessarily the same, and the attributes also change. The structure is similar, only @des...

学习ing 2017-06-28 09:22:18 0  1  1109

concurrency - Java concurrently processes a large amount of data in a table, how to set checkpoints so that they can be used for failure recovery instead of repeatedly processing the processed data?

Java concurrently processes a large amount of data in a table. How to set checkpoints for failure recovery instead of repeatedly processing the processed data? For example, if the system crashes during processing, and before kill -9 is used to force the kill, set a checkpoint and resume processing f...

滿天的星座 2017-05-17 10:08:26 0  1  711

php - Multiple mysql connections to process different databases?

How to implement multiple mysql connections to process different databases? Won't they interfere with each other? !

高洛峰 2017-06-17 09:15:19 0  1  798

Code handling of lengthy data URIs

I use data URI, base64 to add images and videos to my game, but I found that if I want to make a game with multiple videos, each video will be over 500 lines of code, so is there any good way ? Suggested to handle this type of file, what I really did was make a Mixin file and make multiple functions...

P粉872182023 2024-02-03 22:56:39 0  1  438

java - Online application, what should be done if the database operation fails?

I would like to ask for advice on online application. If the database operation (insert, update, delete) fails, what should be the processing logic? Return errors to the user? No processing? Executing once? still?

某草草 2017-06-28 09:23:37 0  4  976

android - When the mobile qq browser processes the data returned by the server, why is the data format sometimes object and sometimes string?

When processing the data returned by the server, the data format obtained from other browsers is all object. The data format obtained from the mobile browser is sometimes object and sometimes string. What is the reason?

伊谢尔伦 2017-06-29 10:09:40 0  1  1110

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

console.log prompts like this: {Code...} Obtain json data from mysql, and encounter this problem. How does the front end handle the conversion and parsing of the json type?

给我你的怀抱 2017-05-18 10:47:53 0  5  803

javascript - How to process the data returned by the server without submitting a get request with a custom xhr?

Prerequisite: The server can already process this get request and return the required data. I would like to ask: If this code is used in the HTML page to make a get request to the server: {code...} Then after the get request is sent, how can I obtain and process the data returned by the server as so...

PHPz 2017-05-19 10:42:58 0  1  715

javascript - About the problem that the name of the nested object in js is a variable

I defined a nested loop in angular2 to display a form. Now I want to process the data entered by the user. The code is as follows {code...} where the names of each array and the nested arrays inside are from the previous ones. The method of obtaining data is generally not fixed. Now I...

習慣沉默 2017-06-26 10:51:55 0  1  698

Server side - how nginx handles data uploaded via udp protocol

I have been using the http protocol. I recently received a device that sends data to the server through the udp protocol. However, I have never used the udp protocol and I don’t know how to handle it. I would like to ask, if data is uploaded through udp protocol, for example, the port is 123, is the...

我想大声告诉你 2017-05-16 17:09:42 0  1  609

Is there any elegant way to handle refreshed/loaded data of the same interface?

Please tell me about your request for list data, pull-down refresh and pull-up loading requests in the same interface. So what is a more appropriate way to process the data when getting the request result? My current approach is to pass the data into the same function, and then judge this request in...

PHP中文网 2017-05-16 13:31:18 0  2  606

SQL processing to clean and sum duplicate data in joined tables

I'm pulling reports from an accounting system. The system has a nasty habit of putting duplicates in the database, which it handles internally (instead of cleaning them up in the first place!) Take the totals table for invoice 125 as an example: +----- -------+-----------+----------+|invoice_id|code...

P粉354948724 2023-09-13 15:15:50 0  1  541

javascript - How to obtain the data bound in the child element (swipe-item) in the change event handler of the applet swiper component

For example, if the sub-element is <swiper-item data-xxx="xxx"></swiper-item>, how can we get the data tied to swiper-item in swiper's change event processing function?

给我你的怀抱 2017-05-19 10:15:56 0  1  1570

javascript - How does js handle data with low-end first and high-end last?

For example, during the interaction with the hardware device, a hexadecimal number is received from the hardware, with the low digit in front and the high digit in the back. How to elegantly parse it into the correct decimal data {code...} Currently The processing method: cut num according to length...

滿天的星座 2017-05-19 10:31:47 0  1  578

symfony3 - Is it possible to use symfony without FormBuilder?

Can forms be nested using pages designed on the front end? Or can I only use FormBuilder to create forms? How to verify and process the data posted from a page written by myself?

天蓬老师 2017-05-16 16:43:53 0  4  475

java - ssm integration gives an error when accessing the presentation layer. .

严重: Servlet.service() for servlet [tour-manager] in context with path [] threw exception [Handler processing failed; nested exception is java.lang.NoSuchMethodError: org.springframework.core.Meth...

phpcn_u1582 2017-05-18 10:44:03 0  1  831

thinkphp3.2 data processing

In the development mode of thinkphp3.2, is there any way to verify sensitive words in the data entered by the user? Can anyone help me? !

世界只因有你 2017-05-27 17:43:08 0  2  617

Nested collapsible visibility issue

`Whenever I expand a nested collapsible, the visibility of its parent is not calculated correctly. Some nested content is missing from the screen This is the html code and js code that handles the scroll height //Getallcollapsiblebuttonsconstcollapsibles=document.getElementsByClassName('collapsible'...

P粉805922437 2024-02-21 19:54:34 0  1  465

javascript - How to use JS to convert between one-dimensional and nested arrays of json objects?

How to convert these two data formats into each other through JS? The same content is combined into a nested format in a flat format, and the nested format is disassembled into a flat format. I have been working on it for a long time and I can’t figure it out. Please help! {code...} {code...}

習慣沉默 2017-05-19 10:13:06 0  3  697