/body"; //记录上个元素的xpath
        var style = ""; //记录上个元素的颜色
        document.body.addEventListener("mousemove",function ()
        {
           oe = document.elementFromPoint(event.x,event.y);
           NowNode = oe;
           x = readXPath(oe);
           oe.style.pointerEvents = "none";
           if (xpath != x){
                try {
                document.evaluate(xpath, document).iterateNext().style.backgroundColor = style; //上个元素改回原来元素的背景�