functions.php上的语法错误

When I add this to the end of my theme function.php I get a syntax error on the last line, how do I fix this?

add_action( 'admin_enqueue_scripts', function() {
    wp_enqueue_style('fontawesome', '//netdna.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css');
}

The statement is incomplete. You never closed the add_action() function call:

add_action( 'admin_enqueue_scripts', function() {
    //...
}); // <--- Need to close the function call and end the statement with a semi-colon

You are missing the closing bracket and semicolon (the ); part):

add_action('admin_enqueue_scripts', function() {
    wp_enqueue_style('fontawesome', '//netdna.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css');
});