使用off（）删除Jquery中元素的其他处理程序

Question

I have the following Fiddle in which I have two event handlers attached to the click event of a button. And my goal is to make the second event handler remove the first one so that only Hello2 is displayed to the user as he presses the button. I have read here that off() method is designed to implement this, but I fail to reach the goal. My guess is that I am using $(document).on(... syntax. Any ideas? I have spent half day on this!!

UPDATE:

Put in other words, I want the second event listener to cancel out/deactivate the first one.

Answer 1

From W3Schools:

// Remove the click event for all <p> elements
$("button").click(function(){
  $("p").off("click");
});

Answer 2

Dont know if this is what you are looking for. But this is one way to do it:

$(function()
{
    $(document).on('click', 'button', function(e){
       alert('hello1');
       e.stopImmediatePropagation();
    });

    $(document).on('click', 'button', function(){
       alert('hello');
    });
});