Element.lastElementChild - Web API 接口参考 编辑

只读属性 ParentNode.lastElementChild 返回对象的最后一个子元素，如果没有子元素，则返回 null。

This property was initially defined in the ElementTraversal pure interface. As this interface contained two distinct set of properties, one aimed at Node that have children, one at those that are children, they have been moved into two separate pure interfaces, ParentNode and ChildNode. In this case, lastElementChild moved to ParentNode. This is a fairly technical change that shouldn't affect compatibility.

语法

var element = node.lastElementChild; 

例子

<ul id="foo">
  <li>First  (1)</li>
  <li>Second (2)</li>
  <li>Third  (3)</li>
</ul>

<script>
var foo = document.getElementById('foo');
// yields: Third  (3)
console.log(foo.lastElementChild.textContent);
</script>

适用于 IE8、IE9 和 Safari 的 Polyfill

// Overwrites native 'lastElementChild' prototype.
// Adds Document & DocumentFragment support for IE9 & Safari.
// Returns array instead of HTMLCollection.
;(function(constructor) {
    if (constructor &&
        constructor.prototype &&
        constructor.prototype.lastElementChild == null) {
        Object.defineProperty(constructor.prototype, 'lastElementChild', {
            get: function() {
                var node, nodes = this.childNodes, i = nodes.length - 1;
                while (node = nodes[i--]) {
                    if (node.nodeType === 1) {
                        return node;
                    }
                }
                return null;
            }
        });
    }
})(window.Node || window.Element);

规范

规范	状态	备注
DOM ParentNode.lastElementChild	Living Standard	Splitted the ElementTraversal interface in ChildNode and ParentNode. This method is now defined on the latter. The Document and DocumentFragment implemented the new interfaces.
Element Traversal Specification ElementTraversal.lastElementChild	Obsolete	Added its initial definition to the ElementTraversal pure interface and use it on Element.

浏览器兼容性

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The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

参见

• 纯接口 ParentNode 和 ChildNode。
• 实现了此纯接口的对象类型：Document、Element，和 DocumentFragment。