function fadeOutItem(item, opacityPath) {
	                var opacity = getItemOpacity(item, opacityPath);
	                var el = item.getGraphicEl();
	                if (opacity == null) {
	                    opacity = 1;
	                }

	                el.traverse(function (child) {
	                    child.trigger('normal');
	                    if (child.type !== 'group') {
	                        child.setStyle('opacity', opacity * 0.1);
	                    }
	                });
	            }
@param {module:echarts/data/List} lineData