Example of using javascript break to specify a tag to break multiple layers of loops

Today, when I read the javascript authoritative guide, I found that there are two types of break syntax (break; and break label ;)... I haven't looked at it carefully before, just a few pages above.

But I don't understand how to write the label, so I checked it online and found an example.
Copy codeThe Code is as follows:
Function foo ()
{
Dance:
For (var k = 0; k <4; k ++ ){
For (var m = 0; m <4; m ++ ){
If (m = 2 ){
Break dance;
}
}
}
}

In this way, you can directly break the entire loop nesting !!

(C, java's break is like this, so reading is not serious ...)