encoding - How to prepare encoded POST data on javascript?

Question

I need to send data by POST method.

For example, I have the string "bla&bla&bla". I tried using encodeURI and got "bla&bla&bla" as the result. I need to replace "&" with something correct for this example.

What kind of method should I call to prepare correct POST data?

UPDATED:

I need to convert only charachters which may broke POST request. Only them.

Answer 1

>>> encodeURI("bla&bla&bla")

"bla&bla&bla"

>>> encodeURIComponent("bla&bla&bla")

"bla%26bla%26bla"