如何把从h1标签内的内容放入到对应的li级内的input的value中
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<ul class="ul_class">
<li class="li_class">
<input id='input_1' value="">
<div id="div_1">
<h1 class="vals">1</h1>
</div>
</li>
<li class="li_class">
<input id='input_1' value="">
<div id="div_1">
<h1 class="vals">2</h1>
</div>
</li>
<li class="li_class">
<input id='input_1' value="">
<div id="div_1">
<h1 class="vals">3</h1>
</div>
</li>
</ul>
<script>
var lis = document.querySelectorAll('li.li_class');
for (var i = 0; i < lis.length; i++)
lis[i].querySelector('input').value = lis[i].querySelector('h1').innerHTML;
</script>