?? calcfactorial.htm
字號:
<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
function butCalculate_onclick()
{
try
{
if (window.top.calcFactorial == null)
throw "This page is not loaded within the correct frameset";
if (document.form1.txtNum1.value == "")
throw "!Please enter a value before you calculate its factorial";
if (isNaN(document.form1.txtNum1.value))
throw "!Please enter a valid number";
if (document.form1.txtNum1.value < 0)
throw "!Please enter a positive number";
document.form1.txtResult.value =
window.parent.calcFactorial(document.form1.txtNum1.value);
}
catch(exception)
{
if (typeof(exception) == "string")
{
if (exception.charAt(0) == "!")
{
alert(exception.substr(1));
document.form1.txtNum1.focus();
document.form1.txtNum1.select();
}
else
{
alert(exception);
}
}
else
{
if (exception.description == null)
{
alert("The following error occurred " + exception.message)
}
else
{
alert("The following error occurred " + exception.description);
}
}
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME="form1">
<INPUT TYPE="text" NAME=txtNum1 SIZE=3> factorial is
<INPUT TYPE="text" NAME=txtResult SIZE=25><BR>
<INPUT TYPE="button" VALUE="Calculate Factorial"
NAME=butCalculate onclick="butCalculate_onclick()">
</FORM>
</BODY>
</HTML>
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