made a websocket chat room. encountered a problem. Where is a better place to keep chat records? Friends list requests the server s chat history interface (that is, to switch chat objects) when clicking Friends , but it doesn t feel right to...

how do I get online files through url and store them in indexedDB? I think the first step should be to download the file, convert it to binary, and then store it. But how to transform it? ...

recently, I intend to cache chat data locally. I encountered some problems in the process of using indexedDB,. The code is as follows let db; let chatDB = { indexedDB: window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.msIn...

{id:1,name: ,age:24,email: qweqwe@qwe.com } {id:2,name: ,age:17,email: qweqwe@qwe.com } {id:3,name: ,age:27,email: qweqwe@qwe.com } {id:4,name: ,age:17,email: qweqwe@qwe.com } {id:5,name: ,age:16,email: qweqwe@qwe.com } how can ...

for example, createObjectStore reported an error when upgrading the version number, because the table has already been created, and the index is also created when the table is created how can I add a new index to the old table when the database version ...

how does indexeddb add or remove indexes from old tables when it is updated? looked up a lot of information, but only one sentence was mentioned about this piece: it can only be modified in onupgradeneeded. But no one said how to modify it. In onupgrad...

problem description I need to dynamically add the "table " (store), of indexddb to the project instead of initializing all the tables to be used at once. However, there is a problem when triggering the version update event, and the crux of the prob...

problem description the environmental background of the problems and what methods you have tried related codes Please paste the code text below (do not replace the code with pictures) what result do you expect? What is the error message actu...

Business scenario: AJAX returns the data res after sending the request, and the returned data is dynamic (maybe a lot, maybe very little). Maybe some need to be updated and some need to be added) I want to implement a judgment to determine whether the...

recently using IndexedDB does not quite understand how to use index + cursor to make a fuzzy query of a date for example, the index I built is a time stamp "PROJDATE ": "0:00:00 on 2019-1-9 " I want to use a fuzzy query to query it as long as it matc...

prompt undefined when calling external JS directly in methods method in VUE is not easy to use var variable, but if this method is placed in mui.ajax (); it works strangely for a long time hoping that God can help me solve . JS <script src=".....

1. When my database is not created, the open method triggers onupgradeneeded, and you can create the table 2. If my database has been created, because the setVersion method has been removed, I can only pass in a larger version trigger upgrade event duri...