如何在不向函数添加代码的情况下向现有javascript函数添加回调函数？

Question

Let say I have foo(). Is there a way to execute bar() after foo() without modifying foo()?

foo(){ /* logic */}

bar(){ /* more logic *}

afterEvent1AlwaysExecute2(foo,bar);

Thank you! any non-jquery or jquery comments are appreciated :)

Answer 1

You can do it without adding code to foo , by reassigning the name foo :

var original_foo = foo;
var foo = function() { original_foo(); bar(); }