FIREFO XML Read and write to realize JS code _javascript skill

read an XML file to a string
Step One: Convert the XML file into a DOM structure
1
var xmldoc = document.implementation.createDocument ("", "test", null);
Xmldoc.load ("D:\\develop\\bookmarks.xml");
2
var req = new XMLHttpRequest ();
Req.open ("Get", "Chrome://passwdmaker/content/people.xml", false);
Req.send (NULL);
var dom = Req.responsexml;
DOM is the DOM structure object
Step two: Convert the DOM structure into an XML string
var serializer = components.classes["@mozilla. Org/xmlextras/xmlserializer;1"].createinstance ( Components.interfaces.nsIDOMSerializer);
var str = serializer.serializetostring (DOM);
STR is the string of XML content
two writes an XML string as an XML file
STR is an XML string
var parser = new Domparser ();
var dom = parser.parsefromstring (str, "text/xml");
var serializer = components.classes["@mozilla. Org/xmlextras/xmlserializer;1"].createinstance ( Components.interfaces.nsIDOMSerializer);
var fostream = components.classes["@mozilla. Org/network/file-output-stream;1"].createinstance ( Components.interfaces.nsIFileOutputStream);
var file = components.classes["@mozilla. Org/file/local;1"].createinstance (Components.interfaces.nsILocalFile);
File.initwithpath ("D:\\develop\\myxmlfile.xml")/position maintained
Fostream.init (file, 0x02 | 0x08 | 0x20, 0664, 0); Write, create, truncate
Serializer.serializetostream (Dom.documentelement, Fostream, ""); Rememeber, Dom is the DOM tree
Fostream.close ();
Attachment:
1 Creating a DOM structure
Generate Document Object
var xmldoc = document.implementation.createDocument ("", "", null);
To create the header of an XML file
<?xml version= "1.0" encoding= "UTF-8" standalone= "yes"?>
var head = xmldoc.createprocessinginstruction ("xml", "Version=\" 1.0\ "encoding=\" utf-8\ "standalone=\");
Xmldoc.appendchild (head);
Create root node
var nodest = xmldoc.createelement ("NodeSet");
Xmldoc.appendchild (nodest);
Creating child nodes
var elem1 = doc.createelement ("name");
Elem1.textcontent = "John";
Nodest.appendchild (ELEM1);
var elem2 = doc.createelement ("name");
Elem2.textcontent = "Dick";
Nodest.appendchild (ELEM2);
The results created are as follows
<?xml version= "1.0" encoding= "UTF-8" standalone= "yes"?><nodeset><name> John > Dick </name></nodeset>
The resulting XMLDOM structure is not automatically indented when it is converted to an XML string, but can be parsed with XML objects.
var serializer = components.classes["@mozilla. Org/xmlextras/xmlserializer;1"].createinstance ( Components.interfaces.nsIDOMSerializer);
Parsing domxml structures to XML strings
XML header must be removed for XML object resolution success
Remove XML headers
var XmlDeclaration =/^<\?xml version[^>]+?>/;
var str = new XML (serializer.serializetostring (xmldoc). Replace (XmlDeclaration, ')). Toxmlstring ();
Haha, now str is an XML string that can be automatically indented. But if your XML has to be coded successfully, precede str with an XML header, and don't forget it.