Node.childNodes - Web APIs 编辑

The Node.childNodes read-only property returns a live NodeList of child nodes of the given element where the first child node is assigned index 0. Child nodes include elements, text and comments.

Syntax

let nodeList = elementNodeReference.childNodes;

Examples

Simple usage

// parg is an object reference to a <p> element

// First check that the element has child nodes
if (parg.hasChildNodes()) {
  let children = parg.childNodes;

  for (let i = 0; i < children.length; i++) {
    // do something with each child as children[i]
    // NOTE: List is live! Adding or removing children will change the list's `length`
  }
}

Remove all children from a node

// This is one way to remove all children from a node
// box is an object reference to an element

while (box.firstChild) {
    //The list is LIVE so it will re-index each call
    box.removeChild(box.firstChild);
}

Notes

The items in the collection of nodes are objects, not strings. To get data from node objects, use their properties. (For example, to get the name of the first childNode: elementNodeReference.childNodes[0].nodeName.)

The document object itself has 2 children: the Doctype declaration and the root element, typically referred to as documentElement. (In (X)HTML documents this is the HTML element.)

childNodes includes all child nodes—including non-element nodes like text and comment nodes. To get a collection of only elements, use ParentNode.children instead.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Node.firstChild
• Node.lastChild
• Node.nextSibling
• Node.previousSibling
• ParentNode.children