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.JavaScriptsma

2、ybelocatedwithintheHTMLcodeatthepointinthepagewheretheyaretoappearonthescreenortheymaybewrittenusingfunctions.FunctionsaresmallsubprogramsthatarestoredbetweentheheadtagsofanHTMLdocumentandarecalledontobeexecutedwhenaparticulareventoccurs.Whetherthescript

3、isstoredbetweentheheadtagsorwithinthebodyoftheHTMLdocument,itmustbeenclosedinscripttags.Also,asetofHTMLcommenttagsaretypicallyusedinsidethescripttagssothatolderbrowsersthatdonotsupportJavaScriptwillignorethescriptandcontinuetoprocessthepagewithouterrors.

4、Followingisanexampleofthescriptandcommenttags:BeawarethatJavaScriptiscasesensitive...thedifferencebetweenaworkingscriptandanerrormessagecanbeonecapitalletter.ALERTBOXESTopopupanalert

5、boxincludethefollowinglineofcodeinsideofscripttagsinthebodyofyourHTMLdocument.Pleasenotethattheprocessingofthepagewillstopuntiltheviewerrespondstothealertbox.alert("Placethetexttobedisplayedinthealertboxbetweenthesequotes.")Othertypesofpre-madedialogboxe

6、sareavailablesuchasthepromptandconfirmboxes.InordertotakefulladvantageofthefeaturesofthesedialogboxesyoumustwritemoreJavaScriptcodewhichcanusethevaluesthatarereturnedbythedialogboxes.Thefollowingstatementswillpopupadialogboxthatrequiresayesornoanswer(OKo

7、rCancel).IftheanswerisOKthenthevariablenamedanswerhasavalueoftrueandiftheanswerisCancelthenthevariablenamedanswerhasavalueoffalse.YoucanthenuseanifstatementintheJavaScriptcodetorespondappropriately.13大连交通大学2013届本科生毕业设计（论文）外文翻译varanswer=confirm("Areyousur

8、eyouwanttoquit?")if(answer==true){window.close()}Thefollowingcodewillpopupadialogboxthataskstheusertoentersomesortofinformation.IftheuserclicksOKtheinformationtheyenteredisstoredinthevariable.Thesecondsetofquotationmarksin