break

break [label];

function testBreak(x) {
  var i = 0;

  while (i < 6) {
    if (i == 3) {
      break;
    }
    i += 1;
  }

  return i * x;
}

outer_block: {
  inner_block: {
    console.log('1'
    break outer_block; // breaks out of both inner_block and outer_block
    console.log(':-(' // skipped
  }
  console.log('2' // skipped
}

block_1: {
  console.log('1'
  break block_2; // SyntaxError: label not found
}

block_2: {
  console.log('2'
}