个回答

• 程序猿涛涛

  2016-01-26 09:21:11

  function checkall(){
              var hobby = document.getElementsByName("hobby");
           
            // 任务1
             for(var a=0;a<hobby.length;a++){
                 hobby[a].checked=true;  //全选
             }
          }
          function clearall(){
              var hobby = document.getElementsByName("hobby");
             
           // 任务2   
              for(var a=0;a<hobby.length;a++){
                 hobby[a].checked=false;  //全不选
             }
          }
         
          function checkone(){
              var j=document.getElementById("wb").value;
         
           // 任务3
          //alert(j)
          var s = j.split("");
             for(var a=0;a<s.length;a++){
                 var h = "hobby"+s[a]; //拼id值
                  var j=document.getElementById(h);
                  j.checked=true;
             }
         
          }

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