var arrEle=document.getElementsByTagName("a");
         for(var i=0;i<arrEle.length;i++)
         {   
            arrEle[i].onfocus= function()
            {
                this.blur();
             }   
         }
   var arrEle=document.getElementsByTagName("button");
         for(var i=0;i<arrEle.length;i++)
         {   
            arrEle[i].onfocus= function()
            {
                this.blur();
             }   
         }