Question: I'm trying to make a simple messenger for my school project

I need to store id number of each chat message inside himself (which is a div tag) and I want to access this value from JavaScript with id or name of div.

sorry for my bad English

Answer: 
Let assume a div tag's id equals to NumberID ( `<div id="NumberID"></div>` )

If you are gonna wanna use javascript,

```
var NumberID = document.getElementById("NumberID").innerHTML;

```

Then you can get the result from the NumberID variable.
So what you want to use for storage is an array cause it's way faster than the DOM and the DOM isn't your storage. Here a small code example how to use an array to store stuff, extract and foreach

```
// declaring the array
const messages = [];

// can be automated to restructure incoming dataformat
function incoming(nodeId, msgId, msg) {
    messages.push({
        // you can store the html node directly for faster access
        // even better if you pass the node as a parameter
        // "node": document.getElementById(nodeId),
        "node": nodeId,
        "msgId": msgId,
        "msg": msg
    })
    // do other stuff here example:
    // appendMsg();
}

// incoming messages
incoming("box-1", 25823, "hi, whats up??")
incoming("box-2", 25824, "not much...")
incoming("box-3", 25825, "wanna learn JS?")
let searchResult = messages.find((ele) => {
    // use return ele.node.id == `box-1` if you store the elements and want to find an element
    return ele.node == "box-2"  
})
console.log(searchResult)

// using map to print the text of all messages
messages.map(ele => console.log(ele.msg))

```