单项选择题
You create a Web page that contains the following image element.
You need to write a JavaScript function that will dynamically change which image is displayed. Which code segment should you use?（）
A.function changeImage（） {myImage.src = "image2.png"； }
B.function changeImage（） { document.getElementById（"myImage"）.src = "image2.png"； }
C.function changeImage（） { getElementById（"myImage"）.src = "image2.png"； }
D.function changeImage（） { window.getElementById（"myImage"）.src = "image2.png"； }
相关考题
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单项选择题
You create a Web page that contains drop-down menus that are defined by using div tags in the following code. You need to write a JavaScript function that will enable the drop-down menus to activate when the user positions the mouse over the menu title. Which code segment should you use？（）
A.$（".dropdown-menu"）.hover（ function （） { $（".menu-items"）.slideDown（100）； }，function （） { $（".menu-items"）.slideUp（100）； } ）；
B.$（".dropdown-menu"）.hover（ function （） { $（".menu-items"， this）.slideDown（100）； }，function （）{ $（".menu-items"， this）.slideUp（100）； } ）；
C.$（".dropdown-menu"）.hover（ function （） { $（this）".slideDown（100）； }， function （） { $（this）.slideUp（100）； } ）；
D.$（".dropdown-menu"）.hover（ function （） { $（"this.menu-title"，）.slideDown（100）； }，function （） {$（"this.menu-title"，）.slideUp（100）； } ）； -
单项选择题
YouareimplementingaWebpagethatdisplaystextthatwastypedbyauser.YouneedtodisplaytheuserinputintheWebpagesothatacross-sitescriptingattackwillbeprevented.Whatshouldyoudo？（）
A.Call document.write.
B.Call Response.Write.
C.Call HttpUtility.UrlEncode.
D.Call HttpUtility.HtmlEncode. -
单项选择题
YouaredevelopingaWebpage.Theusertypesacreditcardnumberintoaninputcontrolnamedccandclicksabuttonnamedsubmit.Thesubmitbuttonsendsthecreditcardnumbertotheserver.AJavaScriptlibraryincludesaCheckCreditCardfunctionthatreturnsavalueoftrueifthecreditcardappearstobevalid,basedonitschecksum.Youneedtoensurethattheformcannotbeusedtosubmitinvalidcreditcardnumberstotheserver.Whatshouldyoudo?（）
A.Configure the input control to run on the server. On the submit button， add a server-side OnClick handler that calls CheckCreditCard and rejects the form submission if the input is invalid.
B.On the input control，add an onChange handler that calls CheckCreditCard and cancels the form submission when the input is invalid.
C.Configure the input control and the submit button to run on the server. Add a submit_OnClick handler that calls CheckCreditCard and rejects the form submission if the input is invalid.
D.On the form， add an onSubmit handler that calls CheckCreditCard and cancels the form submission if the input is invalid.
