),});
           console.log(nodeList);
           NowNode.style.backgroundColor = "#02F78E";
           style = "#02F78E";
        });
        //清除选择项
        function clear() 
        {
            console.log(nodeList);
            //如果最后停留的元素被选中，则调整此元素的style为原始style，否则不进行调整
           for(node of nodeList){
               node["node"].style.backgroundColor = node["bgcolor"];
               if (NowNode == node["node"]){
             