The difference between the two functions? (“function x” vs “var x = function”) [duplicate]

Answer 1

here's an other example: function sayHello(name) { alert('hello' + name) }

now,suppose you want modify onclick event of a button, such as it says "hello world"

you can not write:

yourBtn.onclik = sayHello('world'), because you must provide a function reference.

then you can use second form: yourBtn.onclick = function() { sayHello('workld'); }

Ps: sorry for my bad english!