Document.open()

Ninguno.

Una instancia del objeto Document (Document).

El código simple a continuación abre el documento y reemplaza su contenido con un número de diferentes fragmentos HTML antes de cerrarlo nuevamente.

document.open();
document.write("<p>Hola mundo!</p>");
document.write("<p>Soy un pez</p>");
document.write("<p>El numero es 42</p>");
document.close();

An automatic document.open() call happens when document.write() is called after the page has loaded.

For years Firefox and Internet Explorer additionally erased all JavaScript variables, etc., in addition to removing all nodes. This is no longer the case.document non-spec'ed parameters to document.open

Starting with Gecko 1.9, this method is subject to the same same-origin policy as other properties, and does not work if doing so would change the document's origin.

Starting with Gecko 1.9.2, document.open() uses the principal of the document whose URI it uses, instead of fetching the principal off the stack. As a result, you can no longer call document.write() into an untrusted document from chrome, even using wrappedJSObject. See Security check basics for more about principals.

There is a lesser-known and little-used three-argument version of document.open() , which is an alias of Window.open() (see its page for full details).

This call, for example opens github.com in a new window, with its opener set to null:

document.open("https://www.github.com", "", "noopener=true");

Browsers used to support a two-argument document.open(), with the following signature:

document.open(type, replace);

Where type specified the MIME type of the data you are writing (e.g. text/html) and replace if set (i.e. a string of "replace") specified that the history entry for the new document would replace the current history entry of the document being written to.

This form is now obsolete; it won't throw an error, but instead just forwards to document.open() (i.e. is the equivalent of just running it with no arguments). The history-replacement behavior now always happens.

• Document
• Window.open()