基于prototype的全选反选

<script type="text/javascript">
  function select_all(){ //全选
    var inputs = document.getElementsByTagName("input");
    for(var i=0;i<inputs.length;i++)
    {
      if(inputs[i].getAttribute("type") == "checkbox")
      {
        inputs[i].checked = true;
      }
    }
  }

  function reverse_select_all(){ //反选
    var inputs = document.getElementsByTagName("input");
    for(var i=0;i<inputs.length;i++)
    {
      if(inputs[i].getAttribute("type") == "checkbox")
      {
        inputs[i].checked == true?inputs[i].checked = false:inputs[i].checked = true
      }
    }
  }
</script>