call method
The call method allows you to
call a function with a given context. The
first parameter of the method should be
the context of the function, and the
remaining parameters - the parameters
of the function.
Syntax
javascriptfunction.call(context, parameter1, parameter2...);
Example
Let us have an input:
html<input id="elem" value="text">
Let also be given a function that takes three parameters:
javascriptfunction func(param1, param2, param3) {
console.log(this.value + param1 + param2 + param3);
}
Let's call our function so that this
inside the function is equal to our input,
and at the same time passing it the numbers
1, 2 and 3:
javascriptlet elem = document.querySelector('#elem');
func.call(elem, 1, 2, 3);
Example
Let a function take no parameters:
javascriptfunction func() {
console.log(this.value);
}
In this case, when calling this function
through call, it is enough to pass
only the first parameter with the context:
javascriptlet elem = document.querySelector('#elem');
func.call(elem);