Javascript [Electronic resources] : The Definitive Guide (4th Edition) نسخه متنی

Availability

JavaScript 1.5; JScript 5.5; ECMAScript

Inherits from/Overrides

v3 Inherits from Error

Constructor

new TypeError( )
new TypeError(message)

Arguments

message

An optional error message that provides details about the exception.
If specified, this argument is used as the value for the
message property of the TypeError object.

Returns

A newly constructed TypeError object. If the
message argument is specified, the Error
object will use it as the value of its message
property; otherwise, it will use an implementation-defined default
string as the value of that property. When the TypeError(
) constructor is called as a function, without the
new operator, it behaves just as it does when
called with the new operator.

Properties

message

An error message that provides details about the exception. This
property holds the string passed to the constructor, or an
implementation-defined default string. See
Error.message for details

name

A string that specifies the type of the exception. All TypeError
objects inherit the value "TypeError" for this property.

Description

An instance of the TypeError class is thrown when a value is not of
the type expected. This happens most often when you attempt to access
a property of a null or undefined value. It can
also occur if you invoke a method defined by one class on an object
that is an instance of some other class or if you use the
new operator with a value that is not a
constructor function, for example. JavaScript implementations are
also permitted to throw TypeError objects when a
built-in function or method is called with more arguments than
expected. See Error for details about throwing and
catching exceptions.

See Also

Error, Error.message, Error.name