单击复选框后启用“提交”按钮

Question

我一直在努力让以下代码起作用（例子是在查看本论坛的回复后从jsfiddle获取的。

谁能看到我出错的地方？

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<script type="text/javascript">
      var checkboxes = $("input[type='checkbox']"),
    submitButt = $("input[type='submit']");

checkboxes.click(function() {
    submitButt.attr("disabled", !checkboxes.is(":checked"));
});
      </script>

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script>
<h1>Button should be enabled if at least one checkbox is checked</h1>

<form>
    <div>
        <input type="checkbox" name="option-1" id="option-1"> <label for="option-1">Option 1</label>
    </div>
    <div>
        <input type="checkbox" name="option-2" id="option-2"> <label for="option-2">Option 2</label>
    </div>
    <div>
        <input type="checkbox" name="option-3" id="option-3"> <label for="option-3">Option 3</label>
    </div>
    <div>
        <input type="checkbox" name="option-4" id="option-4"> <label for="option-4">Option 4</label>
    </div>
    <div>
        <input type="checkbox" name="option-5" id="option-5"> <label for="option-5">Option 5</label>
    </div>
    
    <div>
        <input type="submit" value="Do thing" disabled>
    </div>
</form>

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