错误#2007:参数文本必须非空

// This line makes the button, btnConvert wait for a mouse click
// When the button is clicked, the convertNumber function is called
btnConvert.addEventListener(MouseEvent.CLICK, convertNumber);

// These lines make the textinputs wait for a mouse click
// When any of these components are clicked, the clearLabels function is called
txtinNumber.addEventListener(MouseEvent.CLICK, clearLabels);

// Declare Global Variables
var num:int;         // number from 10 - 99
var tensDigit:int;   // the tens digit
var onesDigit:int;   // the ones digit
var teensDigit = [11, 12, 13, 14, 15, 16, 17, 18, 19];

// This is the convertNumber function
// e:MouseEvent is the click event experienced by the button
// void indicates that the function does not return a value
function convertNumber(e:MouseEvent):void
{ 
    getData();
    if (num < 10 || num > 99){
        lblOutput.text = "Invalid number. Enter a number between 10 and 99 inclusive.";
    }
    else{
        lblOutput.text = "";
        if (num >= 20) {
            tensDigit = Math.floor(num / 10);
            onesDigit = num % 10;
            tens();
            ones();
        }
        else{
            tensDigit = Math.floor(num / 10);
            onesDigit = num % 10;
            teens();
        }
    }
    lblOutput.text = 
tens();
lblOutput.text += onesDigit
ones();




}

// This is the getData function
// It gets the number from the user
function getData()
{
    // complete the code here
    num = int(txtinNumber.text);
}

// This is the tens function
// It outputs the word representation of 20, 30, 40,..,90
function tens()
{
    if (tensDigit == 2 && tensDigit < 3)
    {
    lblOutput.text += "Twenty";
    }

    else if (tensDigit == 3 && tensDigit < 4)
    {
    lblOutput.text += "Thirty";
    }

    else if (tensDigit == 4 && tensDigit < 5)
    {
    lblOutput.text += "Forty";
    }

    else if (tensDigit == 5 && tensDigit < 6)
    {
    lblOutput.text += "Fifty";
    }

    else if (tensDigit == 6 && tensDigit < 7)
    {
    lblOutput.text += "Sixty";
    }

    else if (tensDigit == 7 && tensDigit < 8)
    {
    lblOutput.text += "Seventy";
    }

    else if (tensDigit == 8 && tensDigit < 9)
    {
    lblOutput.text += "Eighty";
    }

    else if (tensDigit == 9 && tensDigit < 10)
    {
    lblOutput.text += "Ninety";
    }

    else
    {
    lblOutput.text += "Unknown."
    }

}

// This is the ones function
// It outputs the word representaion for any number from 1 - 9 inclusive
function ones()
{
    if (onesDigit == 1)
    {
        lblOutput.text += " one"
    }

    else if (onesDigit == 2)
    {
        lblOutput.text += " two"
    }

    else if (onesDigit == 3)
    {
        lblOutput.text += " three"
    }

    else if (onesDigit == 4)
    {
        lblOutput.text += " four"
    }

    else if (onesDigit == 5)
    {
        lblOutput.text += " five"
    }

    else if (onesDigit == 6)
    {
        lblOutput.text += " six"
    }

    else if (onesDigit == 7)
    {
        lblOutput.text += " seven"
    }

     else if (onesDigit == 8)
    {
        lblOutput.text += " eight"
    }

    else if (onesDigit == 9)
    {
        lblOutput.text += " nine"
    }



}

// This is the teens function
// It outputs the word representation for any number from 10 - 19 inclusive
function teens()
{
    if (teensDigit == 10)
    {
        lblOutput.text += "Ten"
    }

    else if (teensDigit == 11)
    {
        lblOutput.text += "Eleven"
    }

    else if (teensDigit == 12)
    {
        lblOutput.text += "Twelve"
    }

    else if (teensDigit == 13)
    {
        lblOutput.text += "Thirteen"
    }

    else if (teensDigit == 14)
    {
        lblOutput.text += "Fourteen"
    }

    else if (teensDigit == 15)
    {
        lblOutput.text += "Fifteen"
    }

    else if (teensDigit == 16)
    {
        lblOutput.text += "Sixteen"
    }

    else if (teensDigit == 17)
    {
        lblOutput.text += "Seventeen"
    }

    else if (teensDigit == 18)
    {
        lblOutput.text += "Eighteen"
    }

    else if (teensDigit == 19)
    {
        lblOutput.text += "Nineteen"
    }

    else
    {
        lblOutput.text = "Error."
    }



}

// This is the clearLabels function
// e:MouseEvent is the click event experienced by the textInput
// void indicates that the function does not return a value
function clearLabels(e:MouseEvent):void
{
     lblOutput.text = "";
}