Function.call( ) |
invoke a function as a method of an object |
Availability
JavaScript 1.5; JScript 5.5; ECMAScript
v3
Synopsis
function.call(thisobj, args...)
Arguments
- thisobj
-
The object on which function is to be
invoked. In the body of the function,
thisobj becomes the value of the
this keyword.
- args...
-
Any number of arguments, which will be passed as arguments to
function.
Returns
Whatever value is returned by the invocation of
function.
Throws
- TypeError
-
If this method is invoked on an object that is not a function.
Description
call( ) invokes the specified
function as if it were a method of
thisobj, passing it any arguments that
follow thisobj in the argument list. The
return value of call( ) is the value returned by
the function invocation. Within the body of the function, the
this keyword refers to the
thisobj object.
Use Function.apply( ) instead if you want to
specify the arguments to pass to the function in an array.
Example
// Call the default Object.toString( ) method on an object that
// overrides it with its own version of the method. Note no arguments.
Object.prototype.toString.call(o);
See Also
Function.apply( )
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