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）； } ）；
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A.Call document.write.
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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.
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单项选择题
YouhavecreatedanASP.NETservercontrolnamedShoppingCartforusebyotherdevelopers.SomedevelopersreportthattheShoppingCartcontroldoesnotfunctionproperlywithViewStatedisabled.YouwanttoensurethatallinstancesoftheShoppingCartcontrolworkevenifViewStateisdisabled.Whatshouldyoudo？（）
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