JSFiddle - React, Tailwind, and code Playground

HTML

<div data-bind="click: clickEvent">MyButton</div>

JavaScript

var viewModel = {
    clickEvent : function(item){
        if(this.changableClickEvent){
        alert('1');
            changableClickEvent(item);
            }
    }
    changableClickEvent : null,
}

viewModel.changableClickEvent = function(){
    // logic
    alert('logic');
}

ko.applyBindings(viewModel);