isnull(this.object.ckfs[this.getrow()])什么意思PB的PB的if isnull(this.object.ckfs[this.getrow()]) thenmessagebox("错误","出库方式代号不能相同!",StopSign!)

isnull(this.object.ckfs[this.getrow()])什么意思PB的PB的if isnull(this.object.ckfs[this.getrow()]) thenmessagebox(错误,出库方式代号不能相同!,StopSign!) this object be found here object object IsNull(1) 0 :IsNull(0) 0 : Object doesn't support this property or method如何解决 vfp中 IF语句怎样表示 '如果a、b、c中有任意一个为空'我改成if isnull(thisform.text1.value) or isnull(thisform.text2.value) or isnull(thisform.text3.value)messagebox(请输入数据!)else.endif但是messagebox不出现也没有 SQL isnull( )函数的用法.比如isnull(a,' ')=' ISNULL(CompanyID,0) = 1, C语言和object-C有什么区别没有? 一道VF的题运算结果逻辑为真的是?A empty(.null)b like(xy?,xyz)c isnull(space(0))答案是第二个,为什么, object-c中的 self=[super init]; if(self){...} 34.I don’t mind her criticizing me,but is how she does it that I object to.34.I don’t mind her criticizing me,but____ is how she does it that I object to.A.it B.that C.this D.which为什么选择A?什么语法,句意是什么? This car accident was said to result from violent ______ of a moving object,judging from the evidence collected from the scene.本题1分 A、defect B、impact C、effect D、influence 求高手将下面的公式改写成通达信的求高手将下面的公式改写成通达信,TYP := (IF(ISNULL(HIGH),CLOSE,HIGH) + IF(ISNULL(LOW),CLOSE,LOW) + CLOSE)/3;游侠CCI:EMA((TYP-MA(TYP,36.0270012))/(0.015*AVEDEV(TYP,36.0270012)),2.0332,1),c The company may do all business coherence with this object.英翻中 ：QTP测试运行出现错误Cannot identify the object Register here (of class Link).Verify that this object's properties match an object currently displayed in your application.这是什么错啊 什么意思 if(IsNull.isNull(commonMainViewstr)) { queryTerm = commonMainViewstr.split(:); }是不是判断为空饿