Javascript在元素后附加Child [英] Javascript Append Child AFTER Element

问题描述

我想在一个ul元素中使用javascript追加一个li元素，这是我到目前为止的代码..

I would like to append an li element after another li inside a ul element using javascript, This is the code I have so far..

var parentGuest = document.getElementById("one");
var childGuest = document.createElement("li");
childGuest.id = "two";

我熟悉appendChild，

I am familiar with appendChild,

parentGuest.appendChild(childGuest);

然而，这会将新元素追加到另一个元素中，而不是之后。如何在现有元素之后附加新元素？谢谢。

However this appends the new element inside the other, and not after. How can I append the new element after the existing one? Thanks.

<ul>
  <li id="one"><!-- where the new li is being put --></li>
  <!-- where I want the new li -->
</ul>

推荐答案

您可以使用：

if (parentGuest.nextSibling) {
  parentGuest.parentNode.insertBefore(childGuest, parentGuest.nextSibling);
}
else {
  parentGuest.parentNode.appendChild(childGuest);
}

---

但正如帕维尔指出的那样， referenceElement 可以为null / undefined，如果是，则 insertBefore 表现得像 appendChild 。所以以下内容相当于上述内容：

---

But as Pavel pointed out, the referenceElement can be null/undefined, and if so, insertBefore behaves just like appendChild. So the following is equivalent to the above:

parentGuest.parentNode.insertBefore(childGuest, parentGuest.nextSibling);

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