在JS中点击first后再添加第二个按钮

<div id="buttonContainer">
    <button id="first">First</button>
</div>

document.getElementById("first").addEventListener("click", function() {
    addSecondButton();
});

function addSecondButton() {
    var secondButton = document.createElement("button");
    secondButton.innerHTML = "Second";
    document.getElementById("buttonContainer").appendChild(secondButton);
}