根据数组长度动态添加按钮：JavaScript 实现指南

var AddStock = document.createElement("button"); //Button for adding the ticker to the list
var Ticker = document.createElement("input"); //Input of the tickers that the user is going to use
var TickerChosenContainer = document.createElement("div"); //Container for all the tickers that the user is going to use
var TickerChosenList = []; //This array lets me store all the generated values
let testoutButtonCreated = false; // Flag to track if the button has been created

//Button Add Stock
AddStock.textContent = "Add stock";
AddStock.id = "AddStockBtn";

//Ticker input
Ticker.setAttribute("placeholder", "Enter stock symbol");
Ticker.id = "Ticker";

//Print on display
document.body.appendChild(Ticker);
document.body.appendChild(AddStock);
document.body.appendChild(TickerChosenContainer);

//If 'Add Stock' gets clicked then create a new paragraph with the ticker name just added
AddStock.addEventListener("click", function () {
  var tickerChosen = document.createElement("p");
  tickerChosen.textContent = Ticker.value;
  TickerChosenContainer.appendChild(tickerChosen);
  TickerChosenList.push(tickerChosen);

  if (TickerChosenList.length > 2 && !testoutButtonCreated) {
    var testout = document.createElement("button");
    testout.textContent = "Test Out Button"; // Optional: Set button text
    document.body.appendChild(testout);
    testoutButtonCreated = true; // Set the flag to true
  }
});