`

Javascript全选,反选,全不选

 
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<html>

<head>

<script type="text/javascript">



function checkEvent(name,allCheckId)

{

  var allCk=document.getElementById(allCheckId);

  if(allCk.checked==true)

  checkAll(name);

  else

  checkAllNo(name);

  

}



//全选

function checkAll(name)

{

  var names=document.getElementsByName(name);

  var len=names.length;

  if(len>0)

  {

   var i=0;

   for(i=0;i<len;i++)

   names[i].checked=true;

    

  }

}



//全不选

function checkAllNo(name)

{

  var names=document.getElementsByName(name);

 var len=names.length;

 if(len>0)

  {

    var i=0;

    for(i=0;i<len;i++)

    names[i].checked=false;

  }

}



//反选

function reserveCheck(name)

{

  var names=document.getElementsByName(name);

 var len=names.length;

 if(len>0)

 {

 var i=0;

   for(i=0;i<len;i++)

   {

     if(names[i].checked)

     names[i].checked=false;

     else

     names[i].checked=true;

     

   }

 } 



}



</script>

</head>



<body>

<input type="checkbox" id="ckall" onclick="checkEvent('ckcontact','ckall')" />全选

<input type="checkbox" id="ckReserve" onclick="reserveCheck('ckcontact','ckReserve')" />反选

    <br />

<input type="checkbox" name="ckcontact" value="1" />篮球

    <br />

<input type="checkbox" name="ckcontact" value="2" />旅游

    <br />

<input type="checkbox" name="ckcontact" value="3" />读书

 <br />

<input type="checkbox" name="ckcontact" value="4" />美食

    <br />

<input type="checkbox" name="ckcontact" value="5" />睡觉

</body>



</html>
 
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