public function addJs($path,$priority=5,$group='footer',$slot=null) {
		$this->add($path,'js',$group,$priority,$slot);
	}
public function addJs($path,$priority=5,$group='footer',$slot=null) {
		$this->add($path,'js',$group,$priority,$slot);
	}
public function addJs ( $ path , $ priority = 5 , $ group = 'footer' , $ slot = null ) { $ this -> add ( $ path , 'js' , $ group , $ priority , $ slot ) ; }
add a javascript asset
@param string $path
@param int $priority
@param string $group
@param null $slot
add a javascript asset