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1、第4章DOM基础及高级DOMInthispaper,bysunshinexd22contributionPowerpointdocumentsmaybeapoorexperienceattheWAPend・ItisrecommendedthatyouchooseTXT,ordownloadthesourcefiletothenativeview.Chapter4.DOMbasicsandadvancedDOMtechniquesInthepreviouschapter,brieflyexplainedtheprincipl
2、eofAjaxtechnologyandtechnologysystem,Ajaxtechnologyisakindoffrontdesk,goodJavaScriptbaseisthekeytotheAjaxtechnology.Inthischapterandinthenextfewchapters,youwilllearnabouttheadvanceduseofJavaScript,whichwillprovideagoodfoundationforfutureAjaxdevelopmentcourses.Inth
3、ischapter,youwilllearnaboutthemostimportantobjectDOM,theDOMobject,whichallowsdeveloperstoprocessandviewHTMLpagesasXML(extensiblemarkuplanguage)・Becauseofthecross-languageandcross-platformfeaturesofXML,DOMobjectsarewidelyusedinAjaxtechniques・WhatisDOMobjectInthisse
4、ction,youwilllearnthebasicsofDOMobjects,suchashierarchies,specificDOMobjects,andsoon.ThereadercanhaveabasicideaofthelearningofDOMobjectsinthissection.4.1.1xml-unlimiteddatatransfer?TheDOMobjecthastobementionedinXML,althoughtheDOMobjectisheavilyinfluencedbyDHTMLins
5、omesense,buttheW3CstillappliestheDOMobjectfirsttoXML.XMLwasderivedfromtheearlySGML(standardgeneralizedmarkuplanguage),andSGMLalsosentHTML・SGMLwastheinternationalstandardforinformationmanagement(ISO8879)releasedin1986・SGMLisprimarilyusedtodefinedocumentformatsandin
6、dexes,linkedinformationinplatform-independent・SGMLprovidesuserswithasimilarsyntaxfordefiningthestructureofthedocumentandthelabelofthedocument・Thetagismadeupofatextwrappedin“〈“，〃>“，suchas・Thebeginningtagindicatesthebeginningofadocumentarea・Theclosingtagrepre
7、sentstheEndofadocumentregion,suchas.Theendtagconsistsof/〃，wrappedintext・Notethatthetextintheendtagmustbeconsistentwiththestarttag,thatthestarttagmustbepairedwiththeendtag・SGMLalsoallowsyoutospecifyfeaturesspecifictothecurrentTABinthetag,suchas〃•“Readersmustf
8、indthatthisisverysimilartoHTML,whichwasdevelopedbySGML・Thenodelevelofthe4.1.2XMLdocumentXMLdocumentsfollowthetreestructure,theDOMtree,inwriting・TheDOMtr
