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Use JS to control the style. If the area you want to change is in the displayed state, change it to the hidden state. If it is hidden, change it to the displayed state. Use display:none

<style>
.hidden{display:none;}
</style>
<p class="liebiao">所有問題</p>
<ul class="list_ul hidden">

<li>
    <p>問題一</p>
    <p class="answer hidden">問題答案</p>
</li>

</ul>
$(".liebiao").click(function(){

$(".list_ul").show();

});
$(".list_ul li").click(function(){

$(this).find(".answer").toggle();

});