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YouuseMicrosoft.NETFrameworkv3.5tocreatea&
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YouuseMicrosoft.NETFrameworkv3.5tocreateaMicrosoftASP.NETapplicationforCertkiller.com.
Thecodesegmentbelowiswrittentocreateaclient-script
ThisnewlycreatedscriptwillmakeuseofASP.NETAJAX.ThescriptwillalsoupdatethetextofalltheLabelcontrolsinthewebform.IthascometoyourattentionthattheLabelcontrolsarenotupdatedwhentheclientscriptfunctionistested.However，youreceivethe"’null’isnullornotanobject"JavaScripterrormessageinthebrowser.
Whatshouldyoudo？（）
参考答案: