Adding JS function as third parameter in do_action

Question

First, your callback must be PHP:

function myjsfunction_callback() {
?>
<script>myjsfunction();</script>
<?php
}

Second, you can add multiple callbacks to one action:

add_action( 'myhelp', 'myjsfunction_callback' );
add_action( 'myhelp', 'mysecondfunction' );

Now, you can call do_action() without parameter …

do_action( 'myhelp' );

… and both callbacks will be executed.

I reply to your comment: You can use just one callback:

do_action( 'myhelp', 'mysecondfunction', 'myjsfunction_callback' );

You have to use a rather abstract callback then, and accept more parameters:

add_action( 'myhelp', 'multicall', 10, 99 );

function multicall()
{
    $functions = func_get_args();

    foreach ( $functions as $function )
    {
        if ( function_exists( $function ) )
            $function();
    }
}

Now you can pass up to 99 function names, and all of them will be executed for that action.