function checkone(){
            var hobby = document.getElementsByName("hobby");
            if(hobby.checked==true){
              for(var i=0;i<hobby.length;i++){
              hobby[i].checked=false;
              }
            }
            var j=parseInt(document.getElementById("wb").value);
            if(j<0||j>6) alert("请输入0-6之间的数！");
            else hobby[j-1].checked=true;            
        }