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1、河北建筑工程学院毕业设计（论文）外文资料翻译系别：计算机系专业：计算机科学与技术班级：计092班姓名：孙全华学号：2009309216外文出处：导师提供指导教师评语：签字：年月日英语原文：DocumentObjectModelandDynamicHTMLThetermDynamicHTML,oftenabbreviatedDHTML,referstothetechniqueofmakingWebpagesdynamicbyclient-sidescriptingtomanipulatethedoc
2、umentcontentandpresentation.Webpagescanbemademorelively,dynamic,orinteractivebyDHTMLtechniques.WithDHTML,youcanprescribeactionstriggeredbybrowsereventstomakethepagemorelivelyandresponsive.Suchactionsmayalterthecontentandappearanceofanypartsofthepage.T
3、hechangesarefastandefficientbecausetheyaremadebythebrowserwithouthavingtonetworkwithanyservers.Typically,theclient-sidescriptingiswritteninJavaScriptandbasictechniquesformakingWebpagesdynamic.Contrarytowhatthenamemaysuggest,DHTMLisnotamarkuplanguageor
4、asoftwaretool.ItisatechniquetomakeWebpagesdynamicthroughclient-sideprogramming.Inthepast,DHTMLreliedonbrowser-andvendor-specificfeatures.Makingsuchpagesworkforallbrowsersrequiresmucheffort,testing,andunnecessarilylongprograms.StandardizationeffortsatW
5、3Candelsewherearemakingitpossibletowritestandard-basedDHTMLthatworksforallcompliantbrowsers.Standard-basedDHTMLinvolvesthreeaspects.1.JavaScript—forcross-browserscripting(Chapter9)2.CascadingStyleSheets(CSS)—forstyleandpresentationcontrol(Chapter6)3.D
6、ocumentObjectModel(DOM)—forauniformprogramminginterfacetoaccessandmanipulatetheWebpageasadocumentWhenthesethreeaspectsarecombined,yougettheabilitytoprogramchangesinWebpagesinreactiontouser-orbrowser-generatedevents.Therefore,youcanmakeHTMLpagesmoredyn
7、amic.PopularwithWebdevelopers,supportedbyallmajorbrowsers,andstandardized,JavaScriptprovidestheabilitytoprogrambrowseractionsinresponsetoevents.Tohavetruecross-platformDHTML,westillneedauniformwayforJavaScripttoaccessandmanipulateWebdocuments.Thisbrin
8、gsustotheDOM.10.1WhatisDOM?Theobjectiveofunitandintegrationtestingwastoensurethatthecodeimplementedthedesignproperly;thatis,thattheprogrammerswrotecodetodowhatthedesignersintended.Insystemtesting,wehaveaverydifferentobjective:toensurethatthesy
