Is there any difference between an event with passing parameters to one without passing?

Question

Considering:

jQuery

$("#seletor1").on("click", function(){
    $("#seletor2").trigger("click", {dados: "informação"});
});
$("#seletor2").on("click", function(){
    //faça coisas
});
$("#seletor2").on("click", function(evento, dados){
    //faça coisas
});

Which one will it trigger?

Answer 1

Both will be triggered. The passage of the parameters is determined by who issues the event, not by their appointment in the listeners. Therefore the first parameter (event object) is always passed by jQuery, regardless of whether it is named in your System or not.

In the first case, evento and dados can still be accessed via arguments[0] and arguments[1] respectively:

$("#seletor2").on("click", function(){
    var evento = arguments[0];
    var dados = arguments[1];
});

In your second Systener, the variables do not need to be defined because the parameters are already named, but the object arguments is also available:

$("#seletor2").on("click", function(evento, dados){
    console.log(evento === arguments[0]); // true
    console.log(dados === arguments[1]); // true
});