可折疊只能工作一次（不是 BOOTSTRAP）

Question

我沒有為這個項目使用引導程序。 我在 w3schools 的幫助下制作了一個可折疊的段落，但我面臨的問題是它只能工作一次。 我不知道為什么

 var coll = $("#aboutUsCollapsible"); var tmp = $("#mainCollapsible"); var i; for (i = 0; i < coll.length; i++) { coll[i].addEventListener("click", function() { this.classList.toggle("active"); var content = this.previousElementSibling; if (content.style.maxHeight) { content.style.maxHeight = 0; tmp.show(); } else { tmp.hide(); content.style.maxHeight = content.scrollHeight + "px"; } }); }

 .collapsible-content { max-height: 0; overflow: hidden; transition: max-height 0.2s ease-out; }.collapsible { display: block; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="collapsible" id="mainCollapsible">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </div> <div class="collapsible-content">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</div> <a class="button" id="aboutUsCollapsible">Learn More</a>

Codepen https://codepen.io/amrh910/pen/KKgZEdy

Answer 1

當您檢查content.style.maxHeight時，它應該如下所示：

if (content.style.maxHeight !== "" && content.style.maxHeight !== "0px") {