Element：childElementCount 属性
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
Element.childElementCount 只读属性返回该元素的子元素数量。
示例
js
let sidebar = document.getElementById("sidebar");
if (sidebar.childElementCount > 0) {
// 做点什么
}
规范
| Specification |
|---|
| DOM # dom-parentnode-childelementcount |
浏览器兼容性
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