网页设计外文翻译

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1、大连交通大学2013届本科生毕业设计（论文）外文翻译外文原文Source:WebPageDesignUsingJavaScriptTHEBASICSJAVASCRIPTusesasubsetoftheprogramminglanguageJAVAtoprovideahighlevelofinteractivityonawebpage.JavaScriptsarestoredwithinanHTMLdocumentandareinterpretedbythewebbrowser.JavaScriptsmaybelocatedwithintheHTMLcode

2、atthepointinthepagewheretheyaretoappearonthescreenortheymaybewrittenusingfunctions.FunctionsaresmallsubprogramsthatarestoredbetweentheheadtagsofanHTMLdocumentandarecalledontobeexecutedwhenaparticulareventoccurs.WhetherthescriptisstoredbetweentheheadtagsorwithinthebodyoftheHTMLdocu

3、ment,itmustbeenclosedinscripttags.Also,asetofHTMLcommenttagsaretypicallyusedinsidethescripttagssothatolderbrowsersthatdonotsupportJavaScriptwillignorethescriptandcontinuetoprocessthepagewithouterrors.Followingisanexampleofthescriptandcommenttags:BeawarethatJavaScriptiscasesensitive...thedifferencebetweenaworkingscriptandanerrormessagecanbeonecapitalletter.ALERTBOXESTopopupanalertboxincludethefollowinglineofcodeinsideofscripttagsinthebodyofyourHTMLdocument.Pleasenotethattheprocessingoft

5、hepagewillstopuntiltheviewerrespondstothealertbox.alert("Placethetexttobedisplayedinthealertboxbetweenthesequotes.")Othertypesofpre-madedialogboxesareavailablesuchasthepromptandconfirmboxes.InordertotakefulladvantageofthefeaturesofthesedialogboxesyoumustwritemoreJavaScriptcodewhic

6、hcanusethevaluesthatarereturnedbythedialogboxes.Thefollowingstatementswillpopupadialogboxthatrequiresayesornoanswer(OKorCancel).IftheanswerisOKthenthevariablenamedanswerhasavalueoftrueandiftheanswerisCancelthenthevariablenamedanswerhasavalueoffalse.YoucanthenuseanifstatementintheJ

7、avaScriptcodetorespondappropriately.13大连交通大学2013届本科生毕业设计（论文）外文翻译varanswer=confirm("Areyousureyouwanttoquit?")if(answer==true){window.close()}Thefollowingcodewillpopupadialogboxthataskstheusertoentersomesortofinformation.IftheuserclicksOKtheinformationtheyenteredisstoredinthevariab

8、le.Thesecondsetofquotationmarksin