您需要在HTML中有一个父元素，在该元素下添加这个新创建的开关。
假设你的HTML中有一个div#switch-host。

<div id="switch-host"></div>

然后你将实现一个JS函数，它将把你的开关添加到这个div中，如下所示：

function addSwitch(hostEl) {
  const host = document.getElementById(hostEl);

  const inputEl = document.createElement("input");
  inputEl.setAttribute("type", "checkbox");
  inputEl.setAttribute("checked", false);
  inputEl.dataset.toggle = "toggle";

  host.appendChild(inputEl);
}

然后将此函数调用为

addSwitch("switch-host");

我想这就是你想要的。我使用了一些模板，因为我不喜欢代码中的所有内容。然后我用jQuery修改了值，因为这是一个jQuery插件。
参考：https://developer.mozilla.org/en-US/docs/Web/HTML/Element/template

/* not used
function addButton() {
  var element = document.createElement("input");
  element.type = "button";
  element.value = "View Info";
  element.name = "getInfo";
  element.className = "btn btn-info btn-lg";
}
*/
function clickHandler(event) {
  console.log('clicked toggle');
}

function addSwitchButton() {
  const container = document.getElementById("switchcontainer");
  const template = document.getElementById("myswitch");
  const clone = template.content
    .firstElementChild.cloneNode(true);
  clone.addEventListener("click", clickHandler);
  $(clone).find('.toggle-on').text('View Info');
  $(clone).find('input[type="checkbox"]').attr('name', 'getInfo');

  $(clone).bootstrapToggle();
  container.appendChild(clone);
}
const addme = document.querySelector(".add-switch");
addme.addEventListener("click", addSwitchButton);

body {
  font-size: 16px;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

#switchcontainer {
  margin: 0;
  padding: 0;
  width: 20em;
  height: 10em;
  display: grid;
  place-items: center;
  border: solid #00FF00;
}

.toggle.btn.btn-primary {
  width: 9em;
  height: 2em;
}

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
<link href="https://cdn.jsdelivr.net/gh/gitbrent/bootstrap4-toggle@3.6.1/css/bootstrap4-toggle.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/gh/gitbrent/bootstrap4-toggle@3.6.1/js/bootstrap4-toggle.min.js"></script>

<button type="button" class="add-switch">Add Switch</button>
<div id="switchcontainer"></div>

<template id="myswitch">
<div class="toggle btn btn-primary"  role="button">
  <input type="checkbox" checked="" data-toggle="toggle" data-onstyle="primary">
  <div class="toggle-group">
    <label class="btn btn-primary toggle-on">On</label>
    <label class="btn btn-light toggle-off">Off</label>
    <span class="toggle-handle btn btn-light"></span>
  </div>
</div>
</template>