The function which has named at the time of definition is called a named function. For example
I am assuming that js file name is message.js, place the following script tag inside the head tag.
// for Single line comments and
Timers are used to execute a piece of code at a set time or also to repeat the code in a given interval of time. This is done by using the functions setTimeout, setInterval and clearInterval.
The setTimeout(function, delay) function is used to start a timer that calls a particular function after the mentioned delay. The setInterval(function, delay) function is used to repeatedly execute the given function in the mentioned delay and only halts when cancelled. The clearInterval(id) function instructs the timer to stop.
Timers are operated within a single thread, and thus events might queue up, waiting to be executed.
"==" checks only for equality in value whereas "===" is a stricter equality test and returns false if either the value or the type of the two variables are different.
An alert box displays only one button which is the OK button.
But a Confirmation box displays two buttons namely OK and cancel.
There are three types of errors: