var grid = 50; var grid_w = to

                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /可调大小面板实现（Resizeable Panel）

var grid = 50;

            var grid_w = to_x + ( m_type == 'rb' ? 20:10 ) ;
	    		grid_w = grid_w-grid_w%grid;

	    	var grid_h = to_y + ( m_type == 'rb' ? 20:10 ) ;
	    		grid_h = grid_h-grid_h%grid;