javascript anonymous function

Question

function (){
    alert('a function');
}

when i put it on the firebug javascript control. it shows function statement requires a name

(function (){
    alert('a function');
}())

when i put the above it shows ok.

function (){
    alert('a function');
}()

it also shows function statement requires a name and doesn't execute the function. why?

possible duplicate of [What do parentheses surrounding a JavaScript object/function/class declaration mean?](http://stackoverflow.com/questions/440739/what-do-parentheses-surrounding-a-javascript-object-function-class-declaration-m) — Quentin, May 16 '12 at 10:31

xdazz · Accepted Answer · 2012-05-17T01:44:45.647

1

function (){
    alert('a function');
}

is a function statement, so it requires a name.

(function (){
    alert('a function');
}())

The () change the statement to an expression, so it's OK.

And you could also use the below ways.

(function (){
    alert('a function');
})();

!function (){
    alert('a function');
}();

+function (){
    alert('a function');
}();

edited May 17 '12 at 01:44

answered May 16 '12 at 10:32

xdazz

1 Answers1