另外两个按钮至少被点击一次后，如何启用该按钮？

// HTML代码
<button id="button1" disabled>按钮1</button>
<button id="button2">按钮2</button>
<button id="button3">按钮3</button>

// JavaScript代码
var button1 = document.getElementById("button1");
var button2 = document.getElementById("button2");
var button3 = document.getElementById("button3");

var clickCount = 0;

function enableButton() {
  if (clickCount >= 2) {
    button1.disabled = false;
    // 其他启用按钮的操作
  }
}

button2.addEventListener("click", function() {
  clickCount++;
  enableButton();
});

button3.addEventListener("click", function() {
  clickCount++;
  enableButton();
});