A block statement groups zero or more statements. In languages other than JavaScript, it is known as a compound statement.
Syntax
Here’s the syntax −
{ //List of statements }
To add a label to a block, use the following −
Identifier_for_label: { StatementList }
Let’s use it for break statement. You can try to run the following code to use labels to control the flow, with break statement
Example
Live Demo
<html> <body> <script> document.write("Entering the loop!<br /> "); outerloop: // This is the label name for (var i = 0; i < 5; i++) { document.write("Outerloop: " + i + "<br />"); innerloop: for (var j = 0; j < 5; j++) { if (j > 3 ) break ; // Quit the innermost loop if (i == 2) break innerloop; // Do the same thing if (i == 4) break outerloop; // Quit the outer loop document.write("Innerloop: " + j + " <br />"); } } document.write("Exiting the loop!<br /> "); </script> </body> </html>