setTimeout and setInterval's second param is required? if not, what is the default value?

Question

setTimeout(function(){...}, 100);

my question is can I remove 100 completely? If yes, what is the default value setTimeout receive in all modern browsers?

I had researched in 4 documents but can't find any for my question

w3schools says it is required but mozilla is not required and default value is 0, msdn and nodejs have nothing :)

Why would you *want* to remove it completely? It defines how often the function should be called. — Scott, Aug 27 '15 at 15:21
@Scott sometimes I just want to fix the problem of js execution that don't run if a function is called directly http://stackoverflow.com/questions/779379/why-is-settimeoutfn-0-sometimes-useful — superpan3000, Aug 28 '15 at 03:26

score 2 · Answer 1 · edited Jun 20 '20 at 09:12

handle = window.setTimeout( handler [, timeout [, arguments... ] ] )

handle = window.setInterval( handler [, timeout [, arguments... ] ] )

The 2nd argument (timeout) is optional and

Let timeout be the second method argument, or zero if the argument was omitted.

the default value is 0.

However do note that

Note: Timers can be nested; after five such nested timers, however, the interval is forced to be at least four milliseconds.

1 Answers1