A.isNumber() B.isFinite() C.isNull() D.isNaN()
A.concat() B.pop() C.push() D.shift()
A.〈script language=“JavaScript” language=“show.js”〉〈/script〉 B.〈script language=“JavaScript” type=“show.js”〉〈/script〉 C.〈script language=“JavaScript” src=“show.js”〉〈/script〉 D.〈script language=“JavaScript” runat=“show.js”〉〈/script〉