number
Summary
Returns or sets the numeric value associated with a specific error. The Error object’s default property is number.
Syntax
object .number [ = errorNumber ]
- Object
- Any instance of the Error object.
- errorNumber
- An integer representing an error.
Examples
The following example causes an exception to be thrown and displays the error code that is derived from the error number.
try
{
// Cause an error.
var x = y;
}
catch(e)
{
document.write ("Error Code: ");
document.write (e.number & 0xFFFF)
document.write ("<br />");
document.write ("Facility Code: ")
document.write(e.number>>16 & 0x1FFF)
document.write ("<br />");
document.write ("Error Message: ")
document.write (e.message)
}
The output of this code is as follows.
Error Code: 5009
Facility Code: 10
Error Message: 'y' is undefined
Remarks
An error number is a 32-bit value. The upper 16-bit word is the facility code, and the lower word is the error code. To determine the error code, use the & (bitwise And) operator to combine the number property with the hexadecimal number 0xFFFF.
See also
Other articles
Attributions
Microsoft Developer Network: Article