[WPS JS Tutorial] Determine whether a cell is empty

• undefinedrepresents a null value

function isUndefined(){
	if(Sheets.Item("Sheet1").Range("A1").Value2==undefined){
		Sheets.Item("Sheet1").Range("A2").Value2="A1是空值"
	}else{
		Sheets.Item("Sheet1").Range("A2").Value2="A1不是空值"
	}
}