How are labels used with statements that are not a loop?

Question

According to the ECMAScript 5.1 spec, section 12.12, any statement can be labelled - and in a brief test my browser accepted a label before any statement. The spec also stat

Answer 1

Apparently the break and continue statements can be used within any statement:

http://docstore.mik.ua/orelly/webprog/jscript/ch06_11.htm

In which case things like this become legal:

function show_alert()
{
    label:
    {
        break label;
        alert("Hello! I am an alert box!");
    }
    alert("hi");
}

When show_alert() is called, only the "hi" alert is shown.

As far as I know, this is the only use of the {} code blocks, other than for code styling. (there was a question on here about that, and noone could come up with anything other than readability, but I can't find it now...)

Answer 2

Yes you can label any statement. You just need to put the statement in curly braces, i.e.

{start:var a=1;}

this will not show undefined label error.