break文で、for文のループを終了

<script type="text/javascript">
for ( var counterVar = 1; counterVar <= 10; counterVar++ ) {
    document . write( counterVar + ',' );
    if ( counterVar >= 5 ) {
        break;
    }
}
</script>

<script type="text/javascript">
label1:
for ( var counterVarA = 1; counterVarA <= 3; counterVarA++ ) {
    label2:
    for ( var counterVarB = 1; counterVarB <= 3; counterVarB++ ) {
        label3:
        for ( var counterVarC = 1; counterVarC <= 3; counterVarC++ ) {
            document . write( counterVarA + '-' );
            document . write( counterVarB + '-' );
            document . write( counterVarC + ', ' );
            if ( counterVarC >= 2 ) {
                document . write( '<br />' );
                break label2;
            }
        }
        document . write( '<br />' );
    }
}
</script>