폼태그 새로고침 막기 form
<iframe id="iframe1" name="iframe1" style="display:none"></iframe>
<form class="" method="post" action="/blue/" target="iframe1">
<label>
{% csrf_token %}
<input type="text" name="blue" id="blue">
</label>
<button type="submit" id="blue_btn">blue</button>
</form>