请选择你爱好:<br>

          <input type="checkbox" name="hobby" id="hobby1">  音乐

          <input type="checkbox" name="hobby" id="hobby2">  登山

          <input type="checkbox" name="hobby" id="hobby3">  游泳

          <input type="checkbox" name="hobby" id="hobby4">  阅读

          <input type="checkbox" name="hobby" id="hobby5">  打球

          <input type="checkbox" name="hobby" id="hobby6">  跑步 <br>

          <input type="button" value = "全选" onclick = "a();">

          <input type="button" value = "全不选" onclick = "c();">

          <p>请输入您要选择爱好的序号，序号为1-6:</p>

          <input id="wb" name="wb" type="text" >

          <input name="ok" type="button" value="确定" onclick = "e();">

        </form>

<script type="text/javascript">

function a()

{

var b=document.getElementsByTagName("input");

for(var i=0;i<b.length;i++)

{

if(b[i].type="checkbox")

{

b[i].checked=true;

}

}

}

function c()

{

var d=document.getElementsByName("hobby");

for(var j=0; j<d.length;j++)

{

d[j].checked=false;

}

}

function e()

{

var f=document.getElementById("wb").value;

var g=document.getElementById("hobby"+f);

g.checked=true;

}

</script>