Document.createDocumentFragment() - Web APIs 编辑

Creates a new empty DocumentFragment into which DOM nodes can be added to build an offscreen DOM tree.

Syntax

var fragment = document.createDocumentFragment();

Value

A newly created, empty, DocumentFragment object, which is ready to have nodes inserted into it.

Usage notes

DocumentFragments are DOM Node objects which are never part of the main DOM tree. The usual use case is to create the document fragment, append elements to the document fragment and then append the document fragment to the DOM tree. In the DOM tree, the document fragment is replaced by all its children.

Since the document fragment is in memory and not part of the main DOM tree, appending children to it does not cause page reflow (computation of element's position and geometry). Historically, using document fragments could result in better performance.

You can also use the DocumentFragment constructor to create a new fragment:

let fragment = new DocumentFragment();

Example

This example creates a list of major web browsers in a DocumentFragment, then adds the new DOM subtree to the document to be displayed.

HTML

<ul id="ul">
</ul>

JavaScript

var element  = document.getElementById('ul'); // assuming ul exists
var fragment = document.createDocumentFragment();
var browsers = ['Firefox', 'Chrome', 'Opera',
    'Safari', 'Internet Explorer'];

browsers.forEach(function(browser) {
    var li = document.createElement('li');
    li.textContent = browser;
    fragment.appendChild(li);
});

element.appendChild(fragment);

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• document.implementation.createDocument()
• documentFragment