如何重置事件？

Question

我正在构建一个计算器。我无法显示用户要计算的第二个数字。例如，如果用户想计算10 * 2。我想显示10。单击 *后，我想存储10次以供以后使用，并显示2。

//select screen display element
let screen = document.querySelector(".screen");

//select all calculator number keys
let numberKeys = document.querySelectorAll(".keys");

//select operator elements
let operators = document.querySelectorAll(".operators");


numberKeys.forEach((key) => {
  key.addEventListener("click", (e) => {
    screen.innerText += e.target.innerText;
  });
});

operators.forEach((op) => {
  op.addEventListener("click", (e) => {
    screenValue += screen.innerText;
    operator = e.target.innerText;
    secondNumber += screen.innerText;
  });
});