基于web页面的客服系统中英文

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1、外文翻译院系北方软件学院专业计算机科学与技术班级5233108学号200502331254姓名孙勤指导教师韩宇负责教师韩宇沈阳航空工业学院2007年6月MakeasynchronousrequestswithJavaScriptandAjaxMostWebapplicationsusearequest/responsemodelthatgetsanentireHTMLpagefromtheserver.Theresultisaback-and-forththatusuallyinvolvesclickingabutton,waitingfortheserver,clicking

2、anotherbutton,andthenwaitingsomemore.WithAjaxandtheXMLHttpRequestobject,youcanusearcqucst/rcsponscmodelthatneverleavesuserswaitingforaservertorespond.InthisintroducedaboutallAjax-relatedobjectsandprogrammingapproaches:TheXMLHttpRequestobject.ThisobjectisreallytheonlycommonthreadacrossallAjax

3、applications.IntroducingXMLHttpRequestAJavaScriptobjectcalledXMLHttpRequest.whichhasactuallybeenaroundinseveralbrowsersforquiteawhile,thesearejustafewofthemethodsandpropertiesyou’lluseonthisobject:•open():Setsupanewrequesttoaserver.•scnd():Sendsarequesttoaserver.•abort():Bailsoutofthecurrent

4、request.•readyState:ProvidesthecurrentHTMLreadystate.•responseText:Thetextthattheserversendsbacktorespondtoarequest.ThesimplicityofnewFirst,youneedtocreateanewvariableandassignittoaninstanceoftheXMLHttpRequestobject.That’sprettysimpleinJavaScript;youjustusethenewkeywordwiththeobjectname。Soyo

5、ucreateavariableinJavaScriptwithvar,giveitaname(like"request")，andthenassignittoanewinstanceofXMLHttpRequest.Atthatpoint，you’rereadytousetheobjectinyourfunctions.ErrorhandlingInreallife,thingscangowrongandthiscodedoesn’tprovideanyerror-handling.Aslightlybetterapproachistocreatethisobjectandh

6、aveitfailifsomethinggoeswrong.Createanewvariablecalledrequestandassignitafalsevalue.You’11usefalseasaconditionthatmeanstheXMLHttpRequestobjecthasn’tbeencreatedyet.Addinatry/catchblock:1TryandcreatetheXMLHttpRequestobject.2.2Ifthatfails(catch(failed))，ensurethatrequestisstillsettofalse.Checka

7、ndseeifrequestisstillfalse(ifthingsaregoingokay,itwon’tbe).Iftherewasaproblem(andrequestisfalse)，useaJavaScriptalerttotelluserstherewasaproblem.Nowyou’vegotanerror-proofpieceofcodethatcreatesanXMLHttpRequestobjectandevenletsyouknowifsomethingwentwr