Element.lastElementChild

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

备注： 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, Element and ChildNode. In this case, lastElementChild moved to Element. This is a fairly technical change that shouldn't affect compatibility.

语法

var element = node.lastElementChild;

例子

html

<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

js

// 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

Specification
DOM Standard
# ref-for-dom-parentnode-lastelementchild①

浏览器兼容性

BCD tables only load in the browser

参见