How to remove checked attr on a checkbox when I click it again

This question already has an answer here:

Setting “checked” for a checkbox with jQuery? 38 answers

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If you click an input, you need know if is checked or not. Your button init $('#button').hide(); or display:none.

<div id="button" style="display:none;">YOUR BUTTON</div>

<input class="opc1" type="checkbox" value="1" />
<input class="opc2" type="checkbox" value="2" />

$('.opc1').on("click",function(){
  if($(this).prop('checked')) {
    $('#button').show();
  }else{
   $('#button').show();
  }
});
$('.opc2').on("click",function(){
  if($(this).prop('checked')) {
    $('#button').hide();
    //Also you can use $('#button').remove(); but if you need show this before don't remove.
  }
});

---

我不确定你是什么意思，但如果我明白你正确的你寻找这样的东西：

button{
  display:none;
}
input:checked + input:checked + button{
  display:block !important;
}

Please accept the terms of Conditions<input type="checkbox">
and the License Agreement<input type="checkbox">, thanks!
<button>Thanks, proceed &raquo;</button>

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