如何在框中添加IIF 2个以上的表达式构建器

// HTML
<div id="expression-container">
  <button id="add-expression-btn">添加表达式构建器</button>
</div>

// JavaScript
var expressionContainer = document.getElementById('expression-container');
var addExpressionBtn = document.getElementById('add-expression-btn');

addExpressionBtn.addEventListener('click', function() {
  var expressionBuilder = createExpressionBuilder();
  expressionContainer.appendChild(expressionBuilder);
});

function createExpressionBuilder() {
  var expressionBuilder = document.createElement('input');
  expressionBuilder.type = 'text';
  // 设置表达式构建器的属性和选项

  return expressionBuilder;
}