Node.hasChildNodes()

在此页

Node.hasChildNodes() 方法返回 布尔 value indicating whether the given 节点 has child nodes or not.

bool = node.hasChildNodes();

A 布尔 也就是 true if the node has child nodes, and false 否则。

let foo = document.getElementById('foo');
if (foo.hasChildNodes()) {
  // Do something with 'foo.childNodes'
}

Here is one possible polyfill:

;(function(prototype) {
  prototype.hasChildNodes = prototype.hasChildNodes || function() {
    return !!this.firstChild;
  }
})(Node.prototype);

There are various ways to determine whether the node has a child node:

规范	状态	注释
DOM The definition of 'Node: hasChildNodes' in that specification.	实时标准

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`hasChildNodes`	Chrome 1	Edge 12	Firefox Yes	IE 9	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes